Vascular remodeling device

ABSTRACT

Described herein are vascular remodeling devices that include a proximal section, an intermediate section, and a distal section. During deployment, the proximal section can expand from a compressed delivery state to an expanded state and anchors the device in an afferent vessel of a bifurcation. The distal section expands from the compressed delivery state to an expanded state that may be substantially planar, approximately semi-spherical, umbrella shaped, or reverse umbrella shaped. The distal section is positioned in a bifurcation junction across the neck of an aneurysm or within an aneurysm. The intermediate section allows perfusion to efferent vessels. Before or after the device is in position, embolic material may be used to treat the aneurysm. The distal section can act as a scaffolding to prevent herniation of the embolic material. The device can be used for clot retrieval with integral distal embolic protection.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority to U.S. Provisional Patent App.No. 61/420,275, filed Dec. 6, 2010 and U.S. Provisional Patent App. No.61/448,506, filed Mar. 2, 2011, which are hereby incorporated byreference in their entirety.

BACKGROUND

1. Field

The subject technology relates generally to vascular remodeling devicesand to the manner of their positioning in vessels, and, moreparticularly, to remodeling devices having scaffolding distal sectionsand to the manner of their positioning at the junction of neurovascularbifurcations having an aneurysm and to remodeling devices having embolicprotecting distal sections and to the manner of their use for clotretrieval.

2. Description of Related Art

Neurovascular or cerebral aneurysms affect about 5% of the population.Aneurysms may be located, for example, along arterial side walls (e.g.,the aneurysm 10 illustrated in FIG. 1) and at arterial bifurcations(e.g., the aneurysm 20 illustrated in FIG. 2). The direction of fluidflow is generally indicated by the arrows 16, 26. The aneurysms 10, 20each have a fundus 12, 22, a neck 14, 24, and a fundus-to-neck ratio or“neck ratio.” If the neck ratio is greater than 2 to 1 or if the neck14, 24 is less than 4 mm, the aneurysm 10, 20 may be treated withembolization coils alone because the coils will generally constrainthemselves within the aneurysm 10, 20 without herniating into parentvessels. If the neck ratio is less than 2 to 1 or if the neck 14, 24 isgreater than 4 mm, the aneurysms 10, 20 may be difficult to treat withembolization coils alone because the coils may be prone to herniatinginto parent vessels, as illustrated in FIG. 3A and FIG. 3B. Herniationof coils may cause arterial occlusion, stroke, and/or death. Compared tothe bifurcation illustrated in FIG. 2, the efferent vessels of thebifurcation may be at substantially different angles, have substantiallydifferent sizes, and/or be a different quantity (e.g., three or more).Compared to the bifurcation illustrated in FIG. 2, the aneurysm 20 ofthe bifurcation may be offset with respect to the junction (e.g., havinga neck substantially open to one efferent vessel), tilted with respectto a plane created by the vessels (e.g., into or out of the page), etc.Moreover, vasculature may include more than two efferent vessels (e.g.,three efferent vessels in a trifurcation). Each of these would still beaccurately characterized as a “bifurcation” herein.

In order to inhibit such herniation, tubular neck remodeling devices,for example Neuroform®, available from Boston Scientific, andEnterprise™, available from Cordis Neurovascular, may be used to keepcoils or other materials within the fundus of the aneurysm and out ofthe vessels. Tubular remodeling devices generally consist of a braidedwire or cut metallic stent or stents covering the neck of the aneurysmso that materials introduced into the fundus of the aneurysm do notherniate out of the aneurysm. As illustrated in FIG. 4A, tubularremodeling devices 40 are generally useful for side wall aneurysms 10.As illustrated in FIG. 4B and FIG. 4C, tubular remodeling devices 42, 44are generally less useful for aneurysms 20 at bifurcations (e.g., thebasilar tip area), for example because positioning/shaping theremodeling devices to preserve blood flow through the afferent andefferent vessels while also inhibiting herniation of coils 28 out of theaneurysm 20 can be difficult.

SUMMARY

In some embodiments described herein, an intraluminal vascularremodeling device or stent includes a tubular proximal portion and adistal portion. The proximal portion has an open cell design, a closedcell design, or a hybrid cell design having no reverse free-peaks forretrievability, good flexibility, and/or good wall apposition, or may bebraided from a plurality of filaments. The proximal portion may includeone or more tapered portions that allow the device to be retrievable.The distal portion includes a flower portion or a plurality of ringassemblies each including rings of different sizes and flexibilities.The proximal portion is connected to the distal portion by anintermediate portion that may include a plurality of straight orelongation struts or a unit cell of the proximal portion. Theintermediate portion and the distal portion may be shaped into anumbrella shape or a reverse umbrella shape. The delivery device for thestent includes an outer sheath (e.g., a microcatheter) containing thestent in the compressed delivery state and a plunger configured to pushthe stent out of the outer sheath and to release the stent mechanically,chemically, or electrolytically. The plunger may also include aguidewire lumen for aid in positioning of the delivery device at thetreatment area or for maintaining access distally after delivery of thedevice.

During deployment, the distal portion expands from the compresseddelivery state, possibly to an expanded state, to a further expandedstate that is substantially planar compared to the dimensions of theproximal portion. In some embodiments, the distal section is changed toa further expanded state in a “blooming” action, wherein the distal endof the distal section moves outwardly and proximally, and the proximalend of the distal section moves inwardly and distally. In someembodiments, the distal section is changed to a further expanded statein a “blooming” action, wherein the proximal end of the distal sectionmoves outwardly and distally, and the distal end of the distal sectionmoves inwardly and proximally.

The proximal portion is positioned in an afferent vessel and the distalportion is positioned in a bifurcation junction across the neck of ananeurysm. In some embodiments, at least a portion of certain struts orrings of the distal portion may contact the fundus of the aneurysmand/or be placed inside the aneurysm. The intermediate portion does notinterfere with blood flow to efferent vessels. Before or after the stentis in position, embolic material is used to treat the aneurysm using thestent delivery catheter or a different catheter. The distal portion isconfigured to act as a scaffolding to prevent herniation of objects outof the neck and/or fundus of the bifurcation aneurysm. The distalportion may be configured to allow insertion of embolic materialtherethrough. The device may also or alternatively be used to treat orinhibit ischemic stroke or other diseases by retrieving thrombi or bloodclots. The device may also treat stroke by providing revascularizationbefore or during thrombus retrieval. The proximal section can trap aclot and the distal section can provide distal embolic protection bycatching stray clots and clot fragments.

According to some embodiments, an intraluminal device of the presentdiscloses comprises a proximal section configured to anchor in anafferent vessel; an intermediate section comprising a plurality ofstruts configured to allow perfusion to efferent vessels; and a distalsection configured to act as a scaffolding to inhibit herniation ofobjects out of a neck of a bifurcation aneurysm; wherein each of theplurality of struts is coupled at a coupling to the distal section at aregion between a proximal end of the distal section and a distal end ofthe distal section; wherein the distal section is biased to transitionfrom a first configuration forming a substantially cylindrical shape toa second configuration forming a substantially planar shape whenreleased from a catheter.

According to some embodiments, the proximal section may comprise ahybrid cell design comprising open cells and closed cells. The proximalsection may comprise a plurality of repeating unit cells. The distalsection may comprise at least one said unit cell and at least partiallyforms a semi-sphere, umbrella, reverse umbrella, or flower shape in anexpanded state.

According to some embodiments, the proximal section may comprise aplurality of woven filaments. The proximal section may comprise at leastone tapered portion. The proximal section may have a length betweenabout 5 mm and about 30 mm. The proximal section may have a lengthbetween about 10 mm and about 20 mm. The intermediate section may have alength between about 0 mm and about 6 mm.

According to some embodiments, the substantially cylindrical shape mayhave an inner surface and an outer surface, and each of the innersurface and the outer surface of the substantially cylindrical shape maydefine a respective opposing proximal and distal side of thesubstantially planar shape in the second configuration. The distalsection may have a smallest inner cross-sectional dimension in thesecond configuration that is less than a smallest inner cross-sectionaldimension of the proximal section.

According to some embodiments, while transitioning from the firstconfiguration to the second configuration, (i) a distal portion of thedistal section may be configured to move radially outwardly andproximally relative to the coupling and (ii) a proximal portion of thedistal section may be configured to move radially inwardly and distallyrelative to the coupling. While transitioning from the firstconfiguration to the second configuration, the distal portion may moveto an axial location substantially aligned with or proximal to thecoupling. While transitioning from the first configuration to the secondconfiguration, the distal portion may move radially outwardly to define,in the second configuration, an outermost cross-sectional dimension thatis greater than an outermost cross-sectional dimension of the proximalsection. While transitioning from the first configuration to the secondconfiguration, the proximal portion may move to an axial locationsubstantially aligned with or distal to the coupling. Whiletransitioning from the first configuration to the second configuration,the proximal portion may move radially inwardly to define, in the secondconfiguration, an innermost cross-sectional dimension that is less thanan innermost cross-sectional dimension of the proximal section.

According to some embodiments, when transitioned from the firstconfiguration to the second configuration, the proximal portion of thedistal section may define a first lumen sized smaller than a secondlumen defined by the proximal section.

According to some embodiments, the distal section may pivot about thecoupling when transitioning from the first configuration to the secondconfiguration.

According to some embodiments, while transitioning from the firstconfiguration to the second configuration, (i) a distal portion of thedistal section may be configured to move radially inwardly andproximally relative to the coupling and (ii) a proximal portion of thedistal section may be configured to move radially outwardly and distallyrelative to the coupling. While transitioning from the firstconfiguration to the second configuration, the proximal portion may moveradially outwardly to define, in the second configuration, an outermostcross-sectional dimension that is greater than an outermostcross-sectional dimension of the proximal section. While transitioningfrom the first configuration to the second configuration, the distalportion may move radially inwardly to define, in the secondconfiguration, an innermost cross-sectional dimension that is less thanan innermost cross-sectional dimension of the proximal section.

According to some embodiments, the distal section may comprise aplurality of woven filaments. The proximal section and the distalsection are integrally cut from a tube or a sheet. The proximal sectionand the distal section are comprised of the same material. The distalsection may comprise a covering.

According to some embodiments, an intraluminal device of the presentdiscloses includes a proximal section configured to anchor in anafferent vessel; an intermediate section configured to allow perfusionto efferent vessels; and a distal section comprising a first pluralityof rings and a second plurality of rings; wherein the distal section isconfigured to act as a scaffolding to inhibit herniation of objects outof a neck of a bifurcation aneurysm; wherein the distal section isbiased to transition from a first configuration to a secondconfiguration when released from a sheath; wherein, while in the firstconfiguration, the first plurality of rings and the second plurality ofrings extend parallel to a longitudinal axis of the intraluminal device;and wherein, while in the second configuration, the first plurality ofrings extend radially inwardly and the second plurality of rings extendradially outwardly.

According to some embodiments, the first plurality of rings may be moreflexible than the second plurality of rings. Each of the first pluralityof rings may have a largest dimension smaller than a diameter of theproximal portion and each of the second plurality of rings may have alargest dimension larger than a diameter of the proximal portion. Thefirst and second plurality of ring assemblies each may comprise betweenabout 1 and about 30 rings.

According to some embodiments, a method of manufacturing an intraluminaldevice, comprises: coupling a proximal section to a distal section by anintermediate section, the proximal section configured to anchor in anafferent vessel, the intermediate section configured to allow perfusionto efferent vessels, and the distal section configured to act as ascaffolding to inhibit herniation of objects out of a neck of abifurcation aneurysm.

According to some embodiments, the method of manufacturing may furthercomprise cutting the proximal section from a sheet or a tube. Cuttingthe proximal section may comprise cutting a hybrid cell design.According to some embodiments, the method of manufacturing may furthercomprise cutting the distal section from a sheet or a tube. Cutting thedistal section may comprise cutting a flower portion. Cutting the distalsection may comprise cutting a plurality of rings. According to someembodiments, the method of manufacturing may further comprise cuttingthe intermediate section from a sheet or a tube.

According to some embodiments, coupling the proximal section to thedistal section by the intermediate section may comprise integrallyforming the proximal section, the distal section, and the intermediatesection.

According to some embodiments, the method of manufacturing may furthercomprise weaving the proximal section from a plurality of filaments.According to some embodiments, the method of manufacturing may furthercomprise weaving the distal section from a plurality of filaments.

According to some embodiments, coupling the proximal section to thedistal section by the intermediate section may comprise welding theproximal section to the intermediate section. Coupling the proximalsection to the distal section by the intermediate section may comprisewelding the distal section to the intermediate section.

According to some embodiments, the method of manufacturing may furthercomprise heat setting the proximal section to have an expanded state.According to some embodiments, the method of manufacturing may furthercomprise heat setting the distal section to have a further expandedstate.

According to some embodiments, a method of treating an aneurysm at ajunction of a bifurcation having an afferent vessel and efferentvessels, the aneurysm having a neck and a fundus, comprises: advancing acatheter proximate to the junction of the bifurcation, the catheter atleast partially containing a device in a compressed state, the devicecomprising: a proximal section configured to anchor in an afferentvessel; an intermediate section configured to allow perfusion toefferent vessels; and a distal section configured to act as ascaffolding to inhibit herniation of objects out of a neck of abifurcation aneurysm; expanding the distal section from the compressedstate to a radially expanded state at the junction of the bifurcation,wherein a distal end of the distal section may move radially outwardlyand proximally relative to the proximal section, and a proximal end ofthe distal section may move radially inwardly and distally relative tothe proximal section.

According to some embodiments, the method of treating may furthercomprise expanding the proximal section within an afferent vesselproximal to the bifurcation after expanding the distal section.

According to some embodiments, the method of treating may furthercomprise inserting embolic material into the aneurysm. Inserting theembolic material may comprise inserting the embolic material from thecatheter. Inserting the embolic material may comprise inserting thematerial through a lumen defined by the expanded distal section.Inserting the embolic material is before expanding the distal section.Inserting the embolic material is after expanding the distal section.Inserting the embolic material is during expanding the distal section.Inserting the embolic material may comprise inserting embolic coils.Inserting the embolic material may comprise inserting embolic fluid.

According to some embodiments, the method of treating may furthercomprise retrieving the distal section at least partially back into thecatheter, and redeploying the distal section.

According to some embodiments, expanding the distal section may comprisereleasing the device from the catheter. Releasing the device from thecatheter may comprise mechanical detachment. Releasing the device fromthe catheter may comprise electrolytic detachment. According to someembodiments, the aneurysm may comprise a basilar tip aneurysm.

According to some embodiments, the intermediate section may comprise aplurality of struts and each of the plurality of struts may comprise adistal portion coupled, at a coupling, to the distal section at a regionbetween a proximal end of the distal section and a distal end of thedistal section.

According to some embodiments, a method of retrieving a clot from avessel comprises advancing a catheter in the vessel distal to the clot,the catheter at least partially containing a device in a compressedstate, the device including a proximal section and a distal section;deploying the device from at least partially inside the catheter tooutside the catheter, wherein, during deployment, the proximal sectionself-expands alongside the clot and engages the clot; and the distalsection self-expands to a further expanded state and is configured tocatch stray clots or stray clot fragments, wherein the distal sectionhas a second diameter in the further expanded state, the second diameterlarger than the first diameter, wherein the distal end of the distalsection moves outwardly and proximally, and the proximal end of thedistal section moves inwardly and distally; or the proximal end of thedistal section moves outwardly and distally, and the distal end of thedistal section moves inwardly and proximally; retrieving the device andthe clot (e.g., at least partially back into the catheter or anotherretrieval device); and removing the catheter from the vessel.

According to some embodiments, the vessel may have an inner diameter andthe second diameter is the same as the inner diameter of the vessel. Theproximal section may comprise a tapered portion. The proximal sectionmay comprise a plurality of tapered portions. The proximal section maycomprise a longitudinal slit at least partially defining edges and theedges overlap to form a coiled configuration.

According to some embodiments, during deployment, the edges may springopen to engage the clot. During retrieval, the edges may clamp down onthe clot. The proximal section may comprise a hybrid cell design. Thedistal section may comprise a flower portion. The distal section maycomprise a plurality of rings. The distal section may comprise asemi-sphere, umbrella, or reverse umbrella shape.

According to some embodiments, an intraluminal device comprises: aplurality of forward peaks, wherein at least some of the forward peaksare forward free-peaks; a plurality of reverse peaks; and a strutconnected proximate to a tip of each said reverse peak.

According to some embodiments, at least some of the struts may besubstantially straight. At least some of the struts may be s-shaped orc-shaped. At least some of the struts may be connected to a tip of atleast some of said reverse peaks. At least some of the struts may beconnected offset from a tip of at least some of said reverse peaks. Agroup of forward peaks and reverse peaks may form a unit cell and thedevice may comprise a plurality of connected unit cells repeatinglongitudinally along the device.

The intraluminal device may further comprise a tapered portion. Theintraluminal device may further comprise a plurality of taperedportions.

According to some embodiments, a method of treating an aneurysm at ajunction of a bifurcation having an afferent vessel and efferent vesselscomprises advancing a catheter proximate to the junction of thebifurcation, the catheter at least partially containing a device in acompressed state, the device comprising: a proximal section configuredto anchor in an afferent vessel; an intermediate section comprising aplurality of struts configured to allow perfusion to efferent vessels;and a distal section configured to act as a scaffolding to inhibitherniation of objects out of a neck of a bifurcation aneurysm; whereineach of the plurality of struts comprises a distal portion coupled, at ajoint, to the distal section at a region of the distal section between aproximal end of the distal section and a distal end of the distalsection; expanding the distal section from the catheter at the junctionof the bifurcation, wherein each of the proximal end and the distal endmay pivot about the joint, such that the distal section at leastpartially everts.

For purposes of summarizing the subject technology and the advantagesthat may be achieved over the prior art, certain objects and advantagesof the subject technology are described herein. Of course, it is to beunderstood that not necessarily all such objects or advantages need tobe achieved in accordance with any particular embodiment. Thus, forexample, those skilled in the art will recognize that the subjecttechnology may be embodied or carried out in a manner that achieves oroptimizes one advantage or group of advantages as taught or suggestedherein without necessarily achieving other objects or advantages as maybe taught or suggested herein.

All of these embodiments are intended to be within the scope of thesubject technology herein disclosed. These and other embodiments willbecome readily apparent to those skilled in the art from the followingdetailed description having reference to the attached figures, thesubject technology not being limited to any particular disclosedembodiment(s).

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects, and advantages of the subjecttechnology are described with reference to the drawings of certainembodiments, which are intended to illustrate certain embodiments andnot to limit the subject technology.

FIG. 1 illustrates an example embodiment of a side wall aneurysm.

FIG. 2 illustrates an example embodiment of a bifurcation having ananeurysm.

FIG. 3A illustrates an example embodiment of a side wall aneurysm withherniating embolization coils.

FIG. 3B illustrates an example embodiment of a bifurcation having ananeurysm with herniating embolization coils.

FIG. 4A illustrates an example embodiment of a side wall aneurysmtreated with embolization coils and a tubular remodeling device.

FIG. 4B and FIG. 4C illustrates example embodiments of a bifurcationhaving an aneurysm treated with embolization coils and tubularremodeling devices.

FIG. 5A is a side elevational view of an example embodiment of avascular remodeling device.

FIGS. 5B, 5C, and 5D are front elevational views of example embodimentsof distal sections of the vascular remodeling device of FIG. 5A.

FIGS. 6A, 6B, 6C, and 6D illustrate an example embodiment of furtherexpansion of the distal section of the vascular remodeling device ofFIG. 5A.

FIG. 7A and FIG. 7B illustrate an example embodiment of a method fortreating an aneurysm using the device of FIG. 5A.

FIGS. 8A, 8B, and 8C illustrate example embodiments of vascularremodeling device detachment mechanisms.

FIG. 9A illustrates an example embodiment of a cut patterns in ahypotube for forming the device of FIG. 5A.

FIG. 9B illustrates the cut pattern of FIG. 9A rotated 90°.

FIG. 10A illustrates a perspective view of another example embodiment ofa vascular remodeling device.

FIG. 10B illustrates a front elevational view of the device of FIG. 10A.

FIG. 10C illustrates an example embodiment of a cut pattern in a sheetor a hypotube for forming the device of FIG. 10A.

FIG. 11 illustrates an example embodiment of a treated aneurysm usingthe device of FIG. 10A.

FIGS. 12A, 12B, 12C, 12D, 12E, 12F, 12G, 12H, 12I, and 12J illustrateexample embodiments of proximal sections of vascular remodeling devices.

FIG. 13A and FIG. 13B illustrate example embodiments of intermediatesections of vascular remodeling devices.

FIGS. 14A, 14B, 14C, 14D, 14E, and 14F illustrate example embodiments ofdistal sections of vascular remodeling devices.

FIG. 15 illustrates an example embodiment of a distal section of avascular remodeling device.

FIG. 16 illustrates a side-back perspective view of another exampleembodiment of a vascular remodeling device.

FIG. 17 illustrates a side elevational view of another exampleembodiment of a vascular remodeling device.

FIGS. 18A, 18B, 18C, 18D, and 18E illustrate an example embodiment of amethod for treating an aneurysm using a vascular remodeling device.

FIGS. 19A, 19B, 19C, 19D, and 19E illustrate another example embodimentof a method for treating an aneurysm using a vascular remodeling device.

FIGS. 20A, 20B, and 20C illustrate another example embodiment of amethod for treating an aneurysm using a vascular remodeling device.

FIGS. 21A, 21B, and 21C illustrate example embodiments of a method forclot retrieval using a vascular remodeling device.

FIGS. 22A, 22B, and 22C illustrate example embodiments of proximalsections of a vascular remodeling device.

FIG. 23 illustrates another example embodiment of a vascular remodelingdevice.

DETAILED DESCRIPTION

Although some embodiments and examples are described below, those ofskill in the art will appreciate that the subject technology extendsbeyond the specifically disclosed embodiments and/or uses and obviousmodifications and equivalents thereof. Thus, it is intended that thescope of the subject technology disclosed herein should not be limitedby any particular embodiments described below.

The use of numerical values in the various ranges specified in thisapplication, unless expressly indicated otherwise, are stated asapproximations as though the minimum and maximum values within thestated ranges were both preceded by the word “about.” Slight variationsabove and below the stated ranges may be used to achieve substantiallythe same results as values within the ranges. The disclosure of rangesis intended as a continuous range including every value between theminimum and maximum values recited as well as any ranges that can beformed by such values. Accordingly, the skilled person will appreciatethat many such ratios, ranges, and ranges of ratios can be unambiguouslyderived from the data and numbers presented herein and all representvarious embodiments of the subject technology.

FIG. 5A illustrates an example embodiment of a vascular remodelingdevice 50 comprising a scaffolding distal section 56. It will beappreciated that the device 50 may be more compliant than thevasculature in which it is deployed such that it may be somewhatmisshapen after being deployed, and that certain shapes described hereinare when the device 50 is an expanded (e.g., further expanded) statewith no restriction. The device 50 comprises a proximal section 52 (or“bottom section” or “main body” or “stem” or “tubular portion” or“anchoring section”), an intermediate section 54 (or “middle section” or“open portion” or “flow section”), and a distal section 56 (or “topsection” or “distal portion” or “flower” or “flower portion” or“umbrella section” or “treatment section”). The device 50 can bedelivered via a catheter (e.g., microcatheter, guide catheter, deliverycatheter) into a bifurcation to support an aneurysm filling device withminimal interruption of blood flow in afferent and efferent vessels. Insome embodiments, the device 50 may be retrieved and/or repositioned.

The intermediate section 54 comprises a plurality of struts 55. Thestruts 55 may be straight, curved, or otherwise shaped, such as havingdesign features like the proximal section 52 with the same or adifferent cell size. The struts 55 couple the proximal section 52 to thedistal section 56. In some embodiments, each of the struts 55 containsat least two terminals ends. The terminal ends may connect to each ofthe proximal section 52 and the distal section 56. According to someembodiments, the distal section 56 contains a proximal portion (e.g.,proximal end or proximal terminal end) and a distal portion (e.g.,distal end or distal terminal end). A distal portion (e.g., distal end,or terminal distal end) of each of the struts 55 may couple to or joinwith the distal section 56 at a connection point, coupling location, orjoint between the proximal end of the distal section 56 and the distalend of the distal section 56, as shown in FIG. 6A. The coupling locationforms a joint about which at least some portions of distal section 56may pivot. In some embodiments, at least some of the struts 55 connectwith a distal portion thereof at a middle portion of the distal section56. In some embodiments, at least some of the struts 55 connect with adistal portion thereof at the proximal end of the distal section 56. Insome embodiments, at least some of the struts 55 connect with a distalportion thereof at the distal end of the distal section 56. In someembodiments, the struts 55 have a substantially rectangular or flatcross section (e.g., embodiments, in which the struts 55 compriseribbons or uncut portions of a metallic tube or sheet). In someembodiments, the struts 55 have a substantially round (e.g., circular,elliptical, ovoid) cross section (e.g., embodiments, in which the struts55 comprise round filaments). In some embodiments, the plurality ofstruts 55 comprises two struts 55. In some embodiments, the plurality ofstruts 55 comprises greater than two struts 55. In some embodiments, theplurality of struts 55 comprises between about two struts 55 and abouttwelve struts 55 (e.g., between about three struts 55 and about eightstruts 55, three struts 55, four struts 55, five struts 55, six struts55, seven struts 55, or eight struts 55). Other numbers of struts arealso possible. In certain embodiments, the struts 55 may be equallyspaced and/or oriented on opposite sides of the device 50 (e.g., twostruts 180° apart along the circumference of the device 50, three struts120° apart along the circumference of the device 50, four struts 90°apart along the circumference of the device 50, etc.). When the device50 is placed at a bifurcation, the intermediate section 54 allowsperfusion of blood to efferent vessels because the struts 55 do notblock fluid flow.

In some embodiments, the proximal section 52 has a first diameter andthe distal section 56 has a second diameter greater than the firstdiameter (e.g., due to the further expansion), which may cause thestruts 55 to be angled or curved outwards from the longitudinal axisdefined by the proximal section 52. In certain embodiments, the proximalsection 52 has a round (e.g., circular, elliptical, or ovoid) crosssection. In some embodiments, the proximal section 52 includes filamentshaving a substantially rectangular or flat cross section (e.g.,embodiments, in which the proximal section 52 comprises ribbons or uncutportions of a metallic tube or sheet). In some embodiments, the proximalsection 52 includes filaments having a substantially round (e.g.,circular, elliptical, ovoid) cross section (e.g., embodiments, in whichthe proximal section 52 comprises round filaments). In some embodiments,the proximal section 52 comprises a plurality of z-shaped segmentscoupled by struts (e.g., as illustrated in FIG. 5A). Other patterns ofthe proximal section 52 are also possible, for example as described withrespect to FIGS. 12A-12J. When the device 50 is placed at a bifurcation,the proximal section 52 provides anchoring of the device 50 in theafferent vessel. The proximal section 52 may also facilitate delivery,positioning, retrieval, and/or repositioning of the device 50.

In the example embodiment illustrated in FIG. 5A, the proximal end ofthe proximal section 52 comprises two tapered portions 53. The taperedportions 53 may allow the device 50 or portions thereof (e.g., theproximal section 52) to be retrieved back into a catheter. For example,if the device 50 is being pulled into a catheter, the tapered portions53 may radially compress the proximal section 52. One tapered portion 53or other numbers of tapered portion 53 are also possible.

FIGS. 5B-5D illustrate example embodiments of the distal section 56 in afurther expanded state. The distal section 56 allows for safe andcontrolled placement of coils, and can be designed to support a certainpacking density of coil. Upon deployment, the distal section 56 can beplaced at the neck of an aneurysm and can cover the neck enough thataneurysm filling devices can still be positioned inside the aneurysm. Insome embodiments, the distal section 56 comprises one or more of a mesh,a covering, additional filaments, etc. to achieve a fluid diversioneffect, which may allow the omission of embolic material or an aneurysmfilling device. FIG. 5C illustrates the distal section 56 of FIG. 5Bwith radiopaque markers (e.g., coils) around certain filaments. FIG. 5Dillustrates the distal section 56 with fewer filaments than FIG. 5B.

In some embodiments, the device 50 comprises a self-expanding (e.g.,super elastic, CoCr alloy, polyglycolic acid, polylactic acid, etc.)and/or a shape-memory material (e.g., Nitinol, shape memory polymers,etc.), thereby causing the device 50 to be self-expanding under certainconditions (e.g., not restrained by a catheter). In some embodiments,the proximal section 52, the intermediate section 54, and/or the distalsection 56 may comprise different materials. For example, the distalsection 56 may comprise polymer material while the proximal section 52and the intermediate section 54 comprise metallic material, differentpolymer material, etc. For another example, the distal section 56 maycomprise metallic material while the proximal section 52 and theintermediate section 54 comprise different metallic materials, polymermaterial, etc. Other combinations of materials are also possible. Thedevice 50 can assume a low profile compressed state (e.g., confinedwithin a catheter) for delivery. Upon deployment from the catheter, thedevice 50 expands (e.g., self-expands) from the compressed state to anexpanded state. The distal section 56 expands (e.g., self-expands) to afurther expanded state.

FIGS. 6A-6D illustrate an example embodiment of further expansion of thedistal section 56 of the device 50. FIG. 6A illustrates the device 50 inthe expanded state (e.g., having been released from a catheter). Thedistal section 56 a in the expanded state has substantially the samediameter as the proximal section 52. FIG. 6B illustrates the distalsection 56 b in an intermediate further expanded state in which portionsof the distal section 56 b begin to assume a non-tubular shape, forexample due to shape-setting of the distal section 56. FIG. 6Cillustrates the distal section 56 c in another intermediate furtherexpanded state in which the portions of the distal section 56 c furtherassume a non-tubular shape. FIG. 6D illustrates the distal section 56 din the further expanded state. FIG. 6D is a front perspective view ofthe device 50 of FIG. 5A. In the intermediate further expanded statesand the further expanded state illustrated in FIG. 5A and FIGS. 6B-6D,the distal section 56, 56 b, 56 c, 56 d has a larger diameter than theproximal section 52. As illustrated in FIG. 5A, in the further expandedstate, the distal section 56 may be substantially flat (e.g., flat) orsubstantially planar (e.g., planar). In some embodiments, the distalsection 56 changes or is biased to change to a further expanded state ina “blooming” action, wherein the distal portion of the distal section 56moves radially outwardly and proximally relative to the coupling of thestruts 55 to the distal section 56, and the proximal portion of thedistal section 56 moves radially inwardly and distally relative to thecoupling of the struts 55 to the distal section 56. In some embodiments,the distal section 56 is changed or is biased to change to a furtherexpanded state in a “blooming” action, wherein the proximal end of thedistal section 56 moves radially outwardly and distally relative to thecoupling of the struts 55 to the distal section 56, and the distalportion of the distal section 56 moves radially inwardly and proximallyrelative to the coupling of the struts 55 to the distal section 56. Itwill be appreciated that such actions of distal section 56 or portionsthereof may be performed relative to (a) the coupling of the struts 55to the distal section 56, (b) the proximal section 52, (c) the struts55, (d) the vessel, (e) the aneurysm, (f) a longitudinal axis of thedevice 50, or (g) any other object or location. It will be appreciatedthat the device 50 may not expand from the compressed state to theexpanded state to the further expanded state, but that the proximalsection 52 may expand from the compressed state to the expanded statewhile the distal section 56 may expand from the compressed state to thefurther expanded state (e.g., without the distal section 56 expandingfrom the compressed state to the expanded state). If the device 50 isdeployed from a catheter, the distal section 56 may expand from thecompressed state to the further expanded state, possibly via theexpanded state, after being released from the catheter while theproximal section 52 still remains in the compressed state within thecatheter.

According to some embodiments, as shown in FIGS. 6A-6D, the distalsection 56 at least partially everts or is biased to evert at leastpartially during deployment. As used herein, “evert” and “eversion”refer to a process in which a structure turns inside-out. For example, astructure having a first surface initially facing inward and a secondsurface surface initially facing outward transitions during eversionsuch that at least one of the first surface ultimately faces outward andthe second surface ultimately faces inward. Eversion may be complete orpartial. Partial eversion refers to a process in which the structurebegins, but does not necessarily complete, the transition describedabove. According to some embodiments, a length is defined between (i)each of the connection points at which the terminal ends of struts 55are coupled to the distal section 56 and (ii) the proximal end of distalsection 56. According to some embodiments, a length is defined between(i) each of the connection points at which the terminal ends of struts55 are coupled to the distal section 56 and (ii) the distal end ofdistal section 56. According to some embodiments, each of the proximalend and the distal end may pivot about the connection points. Accordingto some embodiments, each of the proximal end and the distal end maypivot about a section between the distal end and the proximal end, asshown in FIGS. 6A-6D.

According to some embodiments, the distal section 56 forms asubstantially cylindrical (e.g., cylindrical) shape in a first,compressed state, as shown in FIG. 6A. The substantially cylindricalshape may define an inner surface facing radially inward and an outersurface facing radially outward. According to some embodiments, duringor after deployment, the distal section 56 forms or is biased to form asubstantially planar (e.g., planar) shape in a second, expanded state,as shown in FIG. 6D. The distal end and the proximal end of distalsection 56 are substantially coplanar (e.g., coplanar) in the second,expanded state. For example, either one of the distal end and theproximal end may become concentric within the other. In the concentricconfiguration, the distal end and the proximal end may form inner andouter bands having different cross-sectional dimensions. According tosome embodiments, after deployment, the inner surface and the outersurface of the substantially cylindrical shape define opposing sides ofthe substantially planar shape. For example, the inner surface of thesubstantially cylindrical shape may transition to a proximal side of thesubstantially planar shape, and the outer surface of the substantiallycylindrical shape may transition to a distal side of the substantiallyplanar shape. By further example, the inner surface of the substantiallycylindrical shape may transition to a distal side of the substantiallyplanar shape, and the outer surface of the substantially cylindricalshape may transition to a proximal side of the substantially planarshape.

In some embodiments, the device 50 comprises a radiopaque material suchas platinum, platinum-iridium, and/or tantalum (e.g., being at leastpartially formed from the radiopaque material (e.g., having a radiopaquelayer, consisting of a radiopaque material), including radiopaquemarkers). For example, the struts 55 may comprise radiopaque markers.For another example, certain segments of the distal section 56 maycomprise radiopaque markers in the form of marker coils and/or markerbands (e.g., as illustrated in FIG. 5C). For yet another example, thestruts 55 and certain segments of the distal section 56 may compriseradiopaque markers. For another example, structural struts in the distalsection 56 can themselves comprise (e.g., be made from) a radiopaquematerial. For still another example, certain segments of the proximalsection 52 (e.g., the tapered portions 53, tips of peaks) may compriseradiopaque markers. For another example, structural struts in theproximal section 52 can themselves comprise (e.g., be made from) aradiopaque material. It will be appreciated that the amount and type ofradiopaque material used may depend, inter alia, on processtechnologies, desired level of radiopacity, mechanical properties of theradiopaque material, and corrosion properties of the radiopaquematerial.

In some embodiments, the device 50 is configured to be positioned at ajunction of a bifurcation (e.g., a neurovascular bifurcation (e.g., thebasilar tip area)) comprising at least one afferent vessel, efferentvessels, and an aneurysm having a fundus and a neck. For example, insome embodiments, the proximal section 52 is suitably dimensioned to fitin an afferent vessel of a bifurcation (e.g., having a diameter betweenabout 2 mm and about 12 mm, having a diameter between about 6 mm andabout 8 mm, having a diameter less than about 15 mm, having a diametergreater than about 1 mm). For example, in some embodiments, the proximalsection 52 is suitably dimensioned to fit in an afferent vessel of abifurcation. In certain embodiments, the device 50 is configured to actas a scaffolding to inhibit or prevent herniation or prolapse of objects(e.g., embolization coils, thrombi, etc.) out of a neck of an aneurysm.As used herein, “herniation” refers to relocation of coils from animplanted location (e.g., within an aneurysm) to a location other thanthe implanted location (e.g., outside an aneurysm). Herniation may ormay not be caused by an external force acting on the coils. For anotherexample, in some embodiments, the distal section 56 is dense enough thatsuch objects cannot pass. In some embodiments, a relative amount of thedistal section 56 or a portion thereof occupied by the filaments of thedistal section 56 is between about 3% and about 25%. In someembodiments, a relative amount of the distal section 56 or a portionthereof occupied by the filaments of the distal section 56 is betweenabout 3% and about 15%. In some embodiments, a relative amount of thedistal section 56 or a portion thereof occupied by the filaments of thedistal section 56 is at least about 5%. For another example, in someembodiments, the distal section 56 allows insertion of embolic materialtherethrough (e.g., through apertures or spaces between struts orfilaments). In certain embodiments, the device 50 is configured topermit perfusion of fluid (e.g., blood) to efferent vessels of abifurcation. For yet another example, in some embodiments, theintermediate section 54 is substantially devoid of a covering, mesh, orother material between the struts 55, thereby allowing fluid to flowsubstantially unimpeded.

FIG. 7A and FIG. 7B illustrate an example embodiment of a method fortreating an aneurysm 20 using the device 50 at a confluence of afferentand efferent vessels or “junction” at a bifurcation 60 having ananeurysm 20. In some embodiments, the vessels are neurovascular orcranial. For example, the vasculature may include the basilar tipaneurysm, the middle cerebral artery, the anterior communicating artery,or the internal carotid bifurcation. In the case of a basilar tipaneurysm, which is at a junction in which the efferent vessels are atabout a 90° angle to the afferent vessel, deployment of a conventionalaneurysm-bridging stent between the efferent vessels and proximal to theaneurysm neck such that the device can hold embolic material in theaneurysm fundus may be difficult. Treatment of other vasculature,including other than neurovascular or cranial, is also possible.

FIG. 7A shows the proximal section 52 anchored in the afferent vesseland the distal section 56 placed across the neck of the aneurysm 20after being deployed from a catheter (e.g., by being pushed out with aplunger, by retracting the catheter while the device remains stationary,etc.) and expanding as described herein. In some embodiments, the device50 comprises a self-expanding and/or a shape-memory material thatautomatically expands (e.g., self-expands) towards an uncompressed stateor does so upon the application of warm fluid (e.g., saline). The struts55 of the intermediate section 54 allow fluid flow to the efferentvessels. FIG. 7B illustrates a plurality of embolization coils 62inserted in the fundus of the aneurysm 20. It will be appreciated thatthe embolization coils 62 may be a single embolization coil or otherembolic material (e.g., embolic fluid such as Onyx®, available fromev3). The embolization coils 62 or other embolic material may beinserted into the fundus before or after positioning of the device 50.In some embodiments, the embolization coils 62 are inserted in thefundus of the aneurysm 20 using the same catheter from which the device50 is deployed. In some embodiments, the embolization coils 62 areinserted in the fundus of the aneurysm 20 using a different catheterthan the catheter from which the device 50 is deployed. In certain suchembodiments, a guidewire may be used to guide both catheters. The device50 acts as a scaffolding to inhibit or prevent herniation or prolapse ofobjects such as the embolization coils 62 and/or thrombi out of theaneurysm 20. The distal section 56 of the device 50 may allow insertionof embolic material therethrough. The device 50 also allows perfusion offluid (e.g., blood) from the afferent vessel(s) to the efferentvessel(s). If the position of the device 50 is not ideal, it can bepulled back inside the delivery catheters, repositioned, and redeployedat a different (e.g., better) position.

In some embodiments, final release of the device 50 is mechanical (e.g.,by a release mechanism). In some embodiments, release of the device 50is electrolytic (e.g., by applying a small current until a proximal tipof the tapered portions 53 corrodes away). In some embodiments, finalrelease of the device 50 is chemical (e.g., by dissolving a connectingportion with a biocompatible solvent such as DMSO). The delivery systemsand catheter may then be withdrawn from the bifurcation 60, therebyleaving or permanently positioning the device 50 at the junction of thebifurcation 60.

FIGS. 8A-8C illustrate example embodiments of release mechanisms thatmay be used to decouple the device 50 from a pusher wire or otherportion of a delivery catheter. These and other release mechanisms mayalso be used for other devices described herein. In some embodiments,the release mechanism comprises a corrodible wire (e.g., forelectrolytic detachment). In some embodiments, the release mechanismcomprises a chemically reactive substance (e.g., dissolvable by DMSO).In some embodiments, the release mechanism comprises a mechanicalrelease mechanism.

FIG. 8A illustrates a release mechanism 80 comprising a guidewire orcatheter portion comprising an expanded end portion 81 (having a largerdiameter than the portion proximal thereto) and a device proximal endportion comprising a plurality of fingers 82. When the device isconfined within a catheter, the compression of the device materialcauses the fingers 82 to lock around the expanded end portion 81 and tocouple the device proximal end portion to the guidewire or catheterportion. The device may optionally be released by causing the deviceproximal end to exit the catheter (e.g., by pushing a guidewire and/orpulling a catheter), at which point the fingers 82 may flex outwardlyand lose grip on the expanded portion 81 (e.g., as illustrated in FIG.8B). Alternatively, the device proximal end portion may comprise theexpanded portion 81 and the guidewire or catheter portion may comprisethe plurality of fingers 82.

FIG. 8C illustrates an example embodiment of an electrolytic releasemechanism 85 comprising interlocking pieces 86, 87. A guidewire or acatheter portion comprises the piece 86 and the device proximal endportion comprises the piece 87, although a reverse configuration andother piece shapes are also possible. Unlike the expanded end portion 81and the fingers 82 of the embodiment of FIG. 8A and FIG. 8B, theinterlocking pieces 86, 87 are not configured to be released from eachother. Although illustrated as proximal to the pieces 86, 87, a markerband 89 may surround the pieces 86, 87. The device may optionally bereleased by applying an electrical current and causing a narrow portion88 of the device (e.g., proximal (e.g., immediately proximal) to the“bumper” or “glue dome”) to dissolve, thereby releasing the distal endportion of the guidewire or the catheter portion and the device. Inembodiments comprising a marker band 89, the marker band 89 may also bereleased from the guidewire or catheter portion and remain with thedevice by being distal to the narrow portion 88.

It will be appreciated that the term “permanently” does not mean thatthe device 50 is impossible to remove and/or reposition a later time. Insome embodiments, the delivery catheter or a different catheter may beused to retrieve or reposition the device 50. In certain embodiments,the device 50 may be retracted into a catheter after being deployed. Thedevice 50 may then be repositioned, for example, at a new rotationalposition, more proximal or distal to an afferent vessel and/or anefferent vessel, etc, or may be completely removed from the body, forexample prior to delivery of a new device (e.g., a different device 50).Once the user is satisfied with the repositioned properties of thedevice 50 (e.g., size, position, rotation, shape, interaction with thevessels, etc.), the device 50 may be released.

FIG. 9A and FIG. 9B illustrate an example embodiment of a vascularremodeling device 50 at a stage of an example manufacturing processcomprising cutting and shaping a metallic tube (e.g., a laser cuthypotube), FIG. 9B being rotated 90° with respect to FIG. 9A. Other tubediameters are also possible. A laser may cut out portions of the tube,leaving a plurality of filaments in the proximal section 52, struts 55in the intermediate section 54, and a plurality of filaments in thedistal section 56. Other cutting methods (e.g., chemical etch,mechanical cutting, etc.) are also possible.

FIG. 10A illustrates an example embodiment of a vascular remodelingdevice 100 comprising a scaffolding distal section 106. It will beappreciated that the device 100 may be more compliant than thevasculature in which it is deployed such that it may be somewhatmisshapen after being deployed, and that certain shapes described hereinare when the device 100 is an expanded (e.g., further expanded) statewith no restriction. The device 100 comprises a proximal section 102 (or“bottom section” or “main body” or “stem” or “tubular portion” or“anchoring section”), an intermediate section 104 (or “middle section”or “open portion” or “flow section”), and a distal section 106 (or “topsection” or “distal portion” or “flower” or “flower portion” or“umbrella section” or “treatment section”). The device 100 can bedelivered via a catheter (e.g., microcatheter) into a bifurcation tosupport an aneurysm filling device with minimal interruption of bloodflow in afferent and efferent vessels. In some embodiments, the device100 may be retrieved and/or repositioned if needed.

The intermediate section 104 couples the proximal section 102 to thedistal section 106. The intermediate section may comprise reducedmaterial compared to the distal section 106 and/or the proximal section102 to reduce interruption of fluid flow to efferent vessels and/or toreduce the risk of potential obstruction of efferent vessels. Theintermediate section 104 comprises a plurality of struts 105. The struts105 may be straight, curved, or otherwise shaped, such as having designfeatures like the proximal section 102 with the same or a different cellsize. The struts 105 couple the proximal section 102 to the distalsection 106. In some embodiments, the struts 105 have a substantiallyrectangular or flat cross section (e.g., embodiments, in which thestruts 105 comprise ribbons or uncut portions of a metallic tube orsheet). In some embodiments, the struts 105 have a substantially round(e.g., circular, elliptical, ovoid) cross section (e.g., embodiments, inwhich the struts 105 comprise round filaments). In some embodiments, theintermediate section 104 has a length between about 0 mm and about 6 mm.In embodiments in which the intermediate section 104 has a length ofabout 0 mm, the distal section 106 may be directly coupled to theproximal section 102, and the proximal section 102 may comprises apattern and/or porosity that allows perfusion to efferent vessels.

In certain embodiments, the struts 105 are integrally fabricated withthe proximal section 102 and the distal section 106, for example asdescribed with respect to FIG. 10C. In embodiments in which all sections102, 104, 106 of the device 100 are integrally fabricated by being cutfrom the same tube or sheet, the device 100 is of single-piececonstruction. In certain embodiments, the struts 105 are made from adifferent piece and are attached (e.g., welded, glued, adhered,mechanically crimped, mechanically swaged, braided, physical vapordeposited, chemical vapor deposited, etc.) to each of the proximalsection 102 and the distal section 106. Separately formed struts 105allows the struts 105 to be a different material from the proximalsection 102 and the distal section 106, although it will be appreciatedthat flat pieces of metal may also comprise multiple sections comprisingdifferent metals. In some embodiments, the struts 105 comprisebiocompatible metal and/or biocompatible polymer. In some embodiments,the struts 105 comprise radiopaque material (e.g., in the form of aradiopaque core, cladding, coating, small coiled wire, marker band,etc.), which can act as radiopaque markers for improved visibility ofthe device 100 during a procedure and/or following optionalimplantation.

In some embodiments, the plurality of struts 105 comprises two struts105. In some embodiments, the plurality of struts 105 comprises greaterthan two struts 105. In some embodiments, the plurality of struts 105comprises between about two struts 105 and about twelve struts 105(e.g., between about three struts 105 and about eight struts 105, threestruts 105, four struts 105, five struts 105, six struts 105, sevenstruts 105, or eight struts 105). Other numbers of struts 105 are alsopossible. In some embodiments, the struts 105 may be equally spacedand/or oriented on opposite sides of the device 100 (e.g., two struts180° apart along the circumference of the device 100, three struts 120°apart along the circumference of the device 100, four struts 90° apartalong the circumference of the device 100, etc.). In some embodiments,the number of struts 105 corresponds to the number of distal sectionring assemblies described herein. When the device 100 is placed at abifurcation, the intermediate section 104 allows perfusion of blood toefferent vessels because the struts 105 do not block fluid flow.

The proximal section 102 may be flexible and yet have enough radialforce to anchor or maintain the position of the device 100 at abifurcation after deployment (e.g., to inhibit or prevent longitudinalmigration of the device 100). In certain embodiments, the proximalsection 102 has a first diameter and the distal section 106 has a seconddiameter greater than the first diameter (e.g., due to expansion of thedistal section ring assemblies), which may cause the struts 105 to beangled or curved outwards from the longitudinal axis defined by theproximal section 102. In certain embodiments, the proximal section 102has a round (e.g., circular, elliptical, or ovoid) cross section. Insome embodiments, the proximal section 102 includes filaments having asubstantially rectangular or flat cross section (e.g., embodiments, inwhich the proximal section 102 comprises ribbons or uncut portions of ametallic tube or sheet). In some embodiments, the proximal section 102includes filaments having a substantially round (e.g., circular,elliptical, ovoid) cross section (e.g., embodiments, in which theproximal section 102 comprises round filaments). In some embodiments,the proximal section 102 comprises a combination open cell and closedcell design and coupling struts (e.g., as illustrated in FIG. 10A),described in further detail herein. In certain such embodiments, theproximal section 102 may achieve good flexibility and/or have goodvasculature conformance. In some embodiments, the proximal section 102comprises a plurality of woven filaments.

When the device 100 is placed at a bifurcation, the proximal section 102provides anchoring of the device 100 in the afferent vessel. Theproximal section 102 may also facilitate delivery, positioning,retrieval, and/or repositioning of the device 100. In some embodiments,the proximal end of the proximal section 102 comprises a detachmentportion, for example a detachment mechanism described herein, forexample with respect to FIGS. 8A-8C.

In certain embodiments, the proximal section 102 is fully retrievableback into a catheter, which can allow repositioning of portions of thedevice 100. In certain embodiments, the proximal section 102 and theintermediate section 104 are fully retrievable back into a catheter,which can allow repositioning of portions of the device 100. In certainembodiments, the proximal section 102, the intermediate section 104, andthe distal section 106 are fully retrievable back into a catheter, whichcan allow repositioning of portions (e.g., the entirety) of the device100.

FIG. 10A illustrates an embodiment in which the proximal end of theproximal section 102 comprises two tapered portions 103. The taperedportions 103 may allow the device 100 or portions thereof (e.g., theproximal section 102) to be retrieved back into a catheter. For example,if the device 100 is being pulled into a catheter, the tapered portions103 may radially compress the proximal section 102.

The distal section 106 may perform a variety of functions, for exampleproviding support to embolic material such as embolic coils and/ordiversion of blood flow away from an aneurysm. The distal section 106may be atraumatic (e.g., comprising flexible materials, atraumaticshapes, etc.) to inhibit damaging or rupturing aneurysms. The distalsection 106 may be self-aligning to accommodate possible misalignmentbetween the afferent vessel and the neck of the aneurysm. The distalsection 106 or portions thereof (e.g., certain rings or other featuresdescribed herein) may be self-conforming to irregular contours of theneck of the aneurysm.

FIG. 10B illustrates an example embodiment of the distal section 106 inan expanded state. The distal section 106 allows for safe and controlledplacement of coils, and can be designed to support a certain packingdensity of coil. Upon deployment, the distal section 106 can be placedat the neck (e.g., at least partially inside the fundus) of an aneurysmand can cover the neck to reduce the effective neck size enough thataneurysm filling devices can still be positioned inside the aneurysm.The distal section 106 comprises a plurality of ring assemblies. In someembodiments, each ring assembly comprises a first ring 107, a secondring 108, and a third ring 109. The first ring 107 has a firststiffness, the second ring 108 has a second stiffness, and the thirdring 109 has a third stiffness. In certain embodiments, the firststiffness of the first ring 107 is greater than the second stiffness ofthe second ring 108 and the third stiffness of the third ring 109 (e.g.,to provide good support to embolic material). In certain embodiments,the third stiffness of the third ring 109 is less than the firststiffness of the first ring 107 and the second stiffness the second ring108 (e.g., to provide good conformability and to be less traumatic tothe aneurysm).

In certain embodiments, the rings 107, 108, 109 are integrated with theproximal section 102 (e.g., being cut from the same tube or sheet). Inembodiments in which all sections 102, 104, 106 of the device 100 areintegrally fabricated by being cut from the same tube or sheet, thedevice 100 is of single-piece construction. Single-piece constructionmay allow for easier manufacturing. In certain embodiments, the rings107, 108, 109 are formed separately from the proximal portion 102 andare attached (e.g., welded, glued, adhered, mechanically crimped,mechanically swaged, braided, physical vapor deposited, chemical vapordeposited, etc.). In certain such embodiments, the rings 107, 108, 109may comprise different material than the proximal section 102. Forexample, the rings 107, 108, 109 may comprise platinum,platinum-iridium, or a polymer and the proximal section 102 may compriseNitinol or CoCr alloy. Other combinations of materials are alsopossible. Separate or multiple-piece construction may allow forindependent selection of materials that are suited for the intended use.In certain embodiments, some of the rings 107, 108, 109 are integratedwith the proximal section 102 (e.g., being cut from the same tube orsheet) and others of the rings 107, 108, 109 are formed separately fromthe proximal portion and are attached (e.g., welded, glued, adhered,mechanically crimped, mechanically swaged, braided, physical vapordeposited, chemical vapor deposited, etc.). Combination construction mayallow easier fabrication than purely multiple-piece construction andalso some material selection advantages.

In some embodiments, the third ring 109 and/or the second ring 108is/are configured to conform to the contours of the anatomy and/or toself-align to the anatomy in the case of misalignment between the distalend 106 of the device 100 and the aneurysm and/or in the case of offset(e.g., long length, short length) between the afferent vessel and theneck of the aneurysm. In certain embodiments, the second stiffness ofthe second ring 108 is less than the first stiffness of the first ring107 and is greater than the third stiffness of the third ring 109.Stiffness of the rings 107, 108, 109 may be influenced, for example, byhaving different dimensions and/or by different heat treatment processes(e.g., resistive and/or inductive heat treatment processes). In someembodiments, a largest dimension of the ring 107 is smaller than adiameter of the proximal end 102 of the device 100 in an expanded state.In some embodiments, a largest dimension of the ring 109 is larger thana diameter of the proximal end 102 of the device 100 in an expandedstate. In some embodiments, the distal section 102 comprises betweenabout 1 and about 30 rings. In some embodiments, each ring assembly ofthe distal section 102 comprises between about 1 and about 30 rings. Insome embodiments, the distal section 106 comprises one or more of amesh, a covering, additional filaments, etc. to achieve a fluiddiversion effect, which may allow the omission of embolic material or ananeurysm filling device.

FIG. 10C illustrates an example embodiment of a vascular remodelingdevice 100 at a stage of an example manufacturing process comprisingcutting and shaping a metallic sheet. A laser or electrochemical etchingmay cut out portions of the sheet, leaving a plurality of unit cells inthe proximal section 102, struts 105 in the intermediate section 104,and a plurality of rings in the distal section 106. In the embodimentillustrated in FIG. 10C, the proximal section 102, the intermediatesection 104, and the distal section 106 are integrally formed from themetallic sheet and not cut away from each other. In some embodiments inwhich all sections 102, 104, 106 of the device 100 are integrallyfabricated by being cut from the same tube or sheet, the device 100 isof single-piece construction. The cut may be defined by features such asa thickness t of the filaments, effective length l_(e) of the proximalsection 102, tapered length l_(t) of the proximal section 102, and thenumber of unit cells in the proximal section 102. In some embodiments,the width w is between about 0.02 mm and about 0.2 mm. In someembodiments, the width w is between about 0.03 mm and about 0.1 mm. Insome embodiments, the width w is about 0.05 mm. Other widths w are alsopossible. The width w of the filaments may be uniform throughout thedevice 100, or may vary depending on location. For example, strutsconnecting unit cells may be thicker than struts within unit cells. Insome embodiments, the length of a unit cell is between about 1 mm andabout 7 mm. In some embodiments, the length of a unit cell is betweenabout 2 mm and about 5 mm. Other unit cell lengths are also possible.The dimensions described herein, including for example dimensionsdescribed with respect to FIG. 9A and FIG. 9B, may be uniform throughoutthe proximal section 102 of the device 100, or may vary depending onlocation (e.g., increasing from proximal to distal, decreasing fromproximal to distal, combinations thereof, and the like). Dimensions maybe selected, for example, to accommodate certain vasculature, forflexibility, for wall conformance, etc.

After cutting or chemical etching, the sheet may be reshaped (e.g., intoa tube) and the device 100 may be heat treated to impart shape settingto at least the proximal section 102 and the distal section 106. Theshape setting process may include several steps comprising, for example,successively shapes using appropriate tooling to stretch and confine thecut sheet into a new shape during the heat treatment. At the end of theeach heat treatment step, the cut sheet assumes the shape in which itwas confined during the heat treatment process. After shape setting thedevice 100, the distal section 106 may be reshaped and the device 100may be further heat treated to impart further shape setting to at leastthe distal section 106. For example, the rings 107, 108, 109 may beshape set to take the shape illustrated in FIG. 10A and FIG. 10B.According to some embodiments, while in a first, compressed state, eachof a first plurality of rings (e.g., one or more of rings 107, rings108, and rings 109) and each of a second plurality of rings (e.g., oneor more others of rings 107, rings 108, and rings 109) extends parallelto a longitudinal axis of the device 50, as shown in FIG. 10C. Accordingto some embodiments, while in the second, expanded state, each of thefirst plurality of rings extends or is biased to extend radiallyinwardly and each of the second plurality of rings extends or is biasedto extend radially outwardly, as shown in FIG. 10A and FIG. 10B.According to some embodiments, while in the second, expanded state, eachof the first plurality of rings extends or is biased to extend radiallyoutwardly, and each of the second plurality of rings extends or isbiased to extend radially inwardly. According to some embodiments, thefirst plurality of rings may be any of rings 107, 108, 109. According tosome embodiments, the second plurality of rings may be any of rings 107,108, 109. As shown in FIG. 11, a bias, as described herein, may allowone or more rings to be disposed against an inner surface of an aneurysm110.

The final shape (e.g., further expanded state) and size may obtained byseveral such steps. For the final shape, there may be a slit along thelength of the device 100 (e.g., the opposite sides of the sheet are notjoined), or the edge(s) can be welded or otherwise joined together byother methods to form a complete tubular profile. Devices describedherein may also be formed using cut a metallic tube that is reshapedafter being cut, although it will be appreciated that the properties ofthe initial tube and the pattern of the cut may be different.

In some embodiments, the device 100 comprises a self-expanding (e.g.,super elastic, CoCr alloy, such as polyglycolic acid and polylacticacid, etc.) and/or a shape-memory material (e.g., comprising Nitinol,shape memory polymers, etc.), thereby causing the device 100 to beself-expanding under certain conditions (e.g., not restrained by acatheter). In some embodiments, the proximal section 102, theintermediate section 104, and/or the distal section 106 may comprisedifferent materials (e.g., in addition to having different thicknessesas described herein). The device 100 can assume a low profile compressedstate (e.g., confined within a catheter) for delivery. Upon deploymentfrom the catheter, the device 100 expands (e.g., self-expands) from thecompressed state to an expanded state. The distal section 106 expands(e.g., self-expands) to a further expanded state.

In some embodiments, the device 100 comprises a radiopaque material suchas platinum, platinum-iridium, and/or tantalum (e.g., being at leastpartially formed from the radiopaque material (e.g., having a radiopaquelayer, consisting of a radiopaque material), including radiopaquemarkers). For example, the struts 105 may comprise radiopaque markers.For another example, certain segments of the distal section 106 maycomprise radiopaque markers and/or be made from radiopaque materials.For yet another example, the struts 105 and certain segments of thedistal section 106 may comprise radiopaque markers. For still anotherexample, certain segments of the proximal section 104 may compriseradiopaque markers. It will be appreciated that the amount and type ofradiopaque material used may depend, inter alia, on price, desired levelof radiopacity, mechanical properties of the radiopaque material, andcorrosion properties of the radiopaque material.

In some embodiments, the device 100 is configured to be positioned at ajunction of a bifurcation (e.g., a neurovascular bifurcation (e.g., thebasilar tip area)) comprising at least one afferent vessel, efferentvessels, and an aneurysm having a fundus and a neck. For example, insome embodiments, the proximal section 102 is suitably dimensioned tofit in an afferent vessel of a bifurcation (e.g., having a diameterbetween about 2 mm and about 10 mm, having a diameter between about 1 mmand about 15 mm, having a diameter between about 6 mm and about 8 mm,having a diameter less than about 15 mm, having a diameter greater thanabout 1 mm). In some embodiments, the device 100 is configured to act asa scaffolding to inhibit or prevent herniation or prolapse of objects(e.g., embolization coils, thrombi, etc.) out of a neck of an aneurysm.For another example, in some embodiments, the distal section 106 isdense enough that such objects cannot pass. In some embodiments, arelative amount of the distal section 56 or a portion thereof occupiedby the filaments of the distal section 56 is between about 3% and about25%. In some embodiments, a relative amount of the distal section 56 ora portion thereof occupied by the filaments of the distal section 56 isbetween about 3% and about 15%. In some embodiments, a relative amountof the distal section 56 or a portion thereof occupied by the filamentsof the distal section 56 is at least about 5%. For another example, insome embodiments, the distal section 106 allows insertion of embolicmaterial therethrough (e.g., through apertures or spaces between strutsor filaments). In some embodiments, the device 100 is configured topermit perfusion of fluid (e.g., blood) to efferent vessels of abifurcation. For yet another example, in some embodiments, theintermediate section is substantially devoid of a covering, mesh, orother material between the struts 105, thereby allowing fluid to flowsubstantially unimpeded. Some embodiments of distal sections 106comprising a plurality of ring assemblies may be easier to deploy than,for example distal sections comprising a flower portion (e.g., thedistal section 56 of FIGS. 5A-5D).

FIG. 11 illustrates an example embodiment of a device 100 positioned ata junction of a basilar tip aneurysm 110. The proximal section 102 isanchored in the afferent or main vessel 112, the intermediate section104 allows perfusion to the efferent vessels 114, and the distal section116 acts as scaffolding to inhibit herniation of embolic material fromthe aneurysm 110. In some embodiments, positioning of the device 100using the afferent vessel 112 as the delivery path for the device 100may be accomplished as follows. The distal tip of a delivery catheter(e.g., microcatheter or other catheters that can be tracked through andreach the location of the aneurysm 110) is placed inside the aneurysm110 or at the neck of the aneurysm 110. The device 100 is then isinserted in the proximal end of the catheter or may be positioned in thecatheter prior to placement of the distal tip of the delivery catheter.The distal section 106 of the device 100 is then pushed out of thedistal end of the catheter (e.g., using a push wire and pulling thecatheter back), allowing the distal section 106 to expand (e.g.,self-expand) either at least partially inside the aneurysm 110 (e.g., asillustrated in FIG. 11) or at the neck of the aneurysm 110 to conform tothe contour of the neck of the aneurysm 110 and to span the neck of theaneurysm 110 or to reduce the effective size of the neck. Theintermediate section 104 of the device 100 is then pushed out of thedistal end of the catheter (e.g., using a push wire and pulling thecatheter back), allowing the intermediate section 104 to expand (e.g.,self-expand) in the junction of the bifurcation. The proximal section102 of the device 100 is then pushed out of the distal end of thecatheter (e.g., using a push wire and pulling the catheter back),allowing the proximal section 102 to expand (e.g., self-expand) in theafferent vessel 112 to maintain the position of the device 100. Thedevice 100 can be fully retrieved inside the catheter, the position ofthe catheter can be adjusted, and the device 100 can be redeployed, forexample to a more desirable position if the position of any section 102,104, 106 after initial deployment of the device 100 was not as desiredafter initial deployment. Additionally or alternatively, the device 100can be fully retrieved inside the catheter and a different catheter orthe same catheter with a different device (e.g., a device 100 havingdifferent dimensions such as diameter of the proximal portion 102,length of the intermediate portion 104, etc.) can be deployed, forexample at a more desirable position or with more desirable properties(e.g., better anchoring, better neck coverage, etc.). Once the device100 is positioned, the device 100 can be detached from the catheterelectrolytically, mechanically, or chemically. As described herein, forexample with respect to FIGS. 18A-20C, embolic material may be placed inthe aneurysm 110 before, after, and/or during positioning of the device100. The catheter used to deliver the device 100 may be used to deliverembolic material into the fundus of the aneurysm 110. The distal section106 may divert fluid flow from the aneurysm 110, which may allow theomission of embolic material or an aneurysm filling device. Otherdelivery methods of the device 100 and other devices described hereinare also possible, and it will be appreciated that the basilar tipaneurysm was used merely as an example of a bifurcation.

FIGS. 12A-12J illustrate example embodiments of proximal sections 1221,1222, 1223, 1224, 1225, 1226, 1227, 1228, 1229, 1230 that may beincorporated into the devices described herein. FIG. 12A illustrates anexample embodiment of a proximal section 1221 having an “open cell”design, identifiable by the reverse free-peaks 124 and the forwardfree-peaks 125. Open cell designs generally provide good flexibility andwall apposition, but may be difficult to retrieve, for example due toreverse free-peaks snagging or catching on the catheter duringretrieval. FIG. 12B illustrates an example embodiment of a proximalsection 1222 having a “closed cell” design, identifiable by the lack ofany peaks due to contact of all cells at intersections 126. FIG. 12Cillustrates another example embodiment of a proximal section 1223 havinga “closed cell” design, identifiable by the lack of reverse free-peaks127 and forward free-peaks 128, which are connected by struts 129.Closed cell designs are generally easy to deliver and to retrieve, butmay be stiff and provide poor wall apposition (e.g., being prone tokinking rather than bending).

At least one aspect of the subject technology is the realization that ahybrid of open cell and closed cell designs can advantageouslyincorporate the advantages of each design and can avoid the potentialdrawbacks of each design. FIGS. 12D-12H illustrate example embodimentsof proximal sections that are “hybrid” or “combination” designsincluding features of open cell designs and features of closed celldesigns. FIG. 12D illustrates an example embodiment of a proximalsection 1224 having a hybrid cell design. The proximal section 1224comprises forward connected peaks 131, 133, forward free-peaks 132, andreverse connected peaks 134. The forward peaks 133 are connected to thenext unit cell. The proximal section 1224 does not include any reversefree-peaks (124 of FIG. 12A). FIG. 12E illustrates an example embodimentof a proximal section 1225 having a hybrid cell design. The proximalsection 1225 comprises forward connected peaks 131, 133, forwardfree-peaks 132, and reverse connected peaks 134. The forward peaks 133are connected to the next unit cell. The proximal section 1225 does notinclude any reverse free-peaks (124 of FIG. 12A). FIG. 12F illustratesan example embodiment of a proximal section 1226 having a hybrid celldesign. The proximal section 1226 comprises forward connected peaks 131,forward free-peaks 132, and reverse connected peaks 134. The proximalsection 1226 further comprises valleys 135 connected to the next unitcell. The proximal section 1226 does not include any reverse free-peaks(124 of FIG. 12A). FIG. 12G illustrates an example embodiment of aproximal section 1227 having a hybrid cell design. The proximal section1227 comprises forward connected peaks 131, forward free-peaks 132, andreverse connected peaks 134. The proximal section 1227 further comprisesvalleys 135 connected to the next unit cell. The proximal section 1227does not include any reverse free-peaks (124 of FIG. 12A).

FIG. 12H illustrates an example embodiment of a proximal section 1228having a hybrid cell design. The proximal section 1228 comprises forwardconnected peaks 133, forward free-peaks 132, and reverse connected peaks134. The forward peaks 133 are connected to the next unit cell. Eachunit cell comprises forward connected peaks 133 alternating with forwardfree-peaks 132. The proximal section 1228 further comprises peaksconnected to the next unit cell. The proximal section 1228 does notinclude any reverse free-peaks (124 of FIG. 12A). FIG. 12I illustratesan example embodiment of a proximal section 1229 having a hybrid celldesign. The proximal section 1229 comprises forward connected peaks 133,forward free-peaks 132, and reverse connected peaks 134. The forwardpeaks 133 are connected to the next unit cell. Each unit cell comprisesforward connected peaks 133 alternating with forward free-peaks 132. Theproximal section 1229 further comprises peaks connected to the next unitcell. The proximal section 1229 does not include any reverse free-peaks(124 of FIG. 12A). In contrast to the proximal section 1228 of FIG. 12H,the proximal section 1229 of FIG. 12I has fewer diagonal struts (e.g.,missing in the area 138), which may provide better flexibility and/orwall apposition. FIG. 12J illustrates an example embodiment of aproximal section 1230 having a hybrid cell design. The proximal section1230 comprises forward connected peaks 133, forward free-peaks 132, andreverse connected peaks 134. The forward peaks 133 are connected to thenext unit cell. Each unit cell comprises forward connected peaks 133alternating with forward free-peaks 132. The proximal section 1230further comprises peaks connected to the next unit cell. The proximalsection 1230 does not include any reverse free-peaks (124 of FIG. 12A).In contrast to the proximal section 1229 of FIG. 12I, the proximalsection 1230 of FIG. 12J has straight struts 1391, which may be lessprone to twisting during compaction. Combinations of the features of thecell patterns illustrated in FIGS. 12A-12I may be selected based ondesired properties of the proximal section.

FIG. 12B, FIG. 12D, and FIG. 12F illustrate proximal sections 1222,1224, 1226, respectively, having one tapered section 123, while FIG.12A, FIG. 12C, FIG. 12E, FIG. 12G, FIG. 12H, FIG. 12I, and FIG. 12Jillustrate proximal portions 1221, 1223, 1225, 1227, 1228, 1229, 1230,respectively, having two tapered sections 123. A single tapered section123 may advantageously have only one detachment zone and be easy torelease, while a plurality of tapered sections 123 may comprise adetachment zone proximal to each tapered section 123 and may be moredifficult to release. A plurality of tapered sections 123 may have ashorter taper length l_(t) and a longer effective length l_(e) (FIG. 9A,FIG. 9B, and FIG. 10C), while a single tapered section 123 may have alonger taper length l_(t) and a shorter effective length l_(e) (FIG. 9A,FIG. 9B, and FIG. 10C) and may provide less anchoring in the afferentvessel. A plurality of tapered sections 123 may be more symmetrical andprovide more uniform wall apposition. A plurality of tapered sections123 may have less of a tension effect on the vessel, which may resultfrom a single long tapered area applying force to a single side of thevessel. The effective length l_(e) of the proximal section may be basedon the intended anatomy. Longer lengths may be appropriate for morevessel wall apposition, while shorter lengths may be appropriate fortraversing more tortuous anatomy. In some embodiments, the effectivelength l_(e) of the proximal section is between about 5 mm and about 40mm. In some embodiments, the effective length l_(e) of the proximalsection is between about 10 mm and about 30 mm. In some embodiments, theeffective length l_(e) of the proximal section is between about 10 mmand about 20 mm. Other effective lengths l_(e) are also possible.

FIG. 12C, FIG. 12F, and FIG. 12G illustrate proximal sections 1223,1226, 1227, respectively, comprising s-shaped struts 129 connectingcertain forward peaks and reverse peaks. FIG. 12D, FIG. 12E, and FIG.12J illustrate proximal portions 1224, 1225, 1230, respectively,comprising straight struts 1391 connecting certain forward peaks andreverse peaks. FIG. 12H and FIG. 12I illustrate proximal portions 1228,1229 comprising c-shaped struts 1392 connecting certain forward peaksand reverse peaks. Connection struts having an s-shape or c-shape may bemore flexible, but may be prone to twisting during compaction, whilestraight struts may be easier to compress but less flexible, which maybe acceptable for hybrid cell designs already having suitableflexibility.

FIG. 12D and FIG. 12E illustrate proximal sections 1224, 1225 havingtip-to-tip connections between forward and reverse peaks, which mayprovide a smaller compaction profile. FIG. 12F, FIG. 12G, FIG. 12H, andFIG. 12I illustrate proximal sections 1226, 1227, 1228, 1229 having atleast partially offset tip-to-tip connections between forward andreverse peaks, which may provide increased flexibility and/or mayincrease vessel conformance.

FIG. 12D, FIG. 12E, FIG. 12H, FIG. 12I, and FIG. 12J illustrate proximalsections 1224, 1225, 1228, 1229, 1230, respectively, having tip-to-tipconnections between forward and reverse peaks of unit cells, which mayprovide an easier compaction profile. FIG. 12F and FIG. 12G illustrateproximal sections 1226, 1227 having valley-to-tip connections betweenforward and reverse peaks of unit cells, which may provide goodflexibility.

The patterns described herein can be repeated (e.g., repetition of rowsof unit cells), adjusted (e.g., different angles, different lengths,different thicknesses, etc.), and/or combined (e.g., permutations of anyof the features disclosed herein) based on the desired properties of theproximal section. In some embodiments, the proximal section may be flowdiverting, which may allow the device to be used across sidewallaneurysms, for example as shown in FIG. 4A. In some embodiments,radiopaque markers are integrated into a portion (e.g., the distal peaksof the forward free-peaks, around the struts, etc.) of the proximalsection that the user (e.g., physician) can use to monitor placement ofthe device.

FIG. 13A and FIG. 13B illustrate example embodiments of intermediatesections 1341, 1342 that may be incorporated into the devices describedherein. FIG. 13A illustrates an example embodiment of an intermediatesection 1341 comprising a plurality of straight struts 125. The numberof struts 125 may be selected, for example, based on the expected weightof the embolic coils. For example, as coil weight increases, the numberof struts 125 may increase. In some embodiments, the plurality of struts125 comprises two struts 125. In some embodiments, the plurality ofstruts 125 comprises greater than two struts 125. In some embodiments,the plurality of struts 125 comprises three struts 125 (e.g., asillustrated in FIG. 13A). In some embodiments, the plurality of struts125 comprises between about two struts 125 and about twelve struts 125(e.g., between about three struts 125 and about eight struts 125, threestruts 125, four struts 125, five struts 125, six struts 125, sevenstruts 125, or eight struts 125). Other numbers of struts 125 are alsopossible. In some embodiments, the struts 125 may be equally spacedand/or oriented on opposite sides of the device (e.g., two struts 180°apart along the circumference of the device, three struts 120° apartalong the circumference of the device, four struts 90° apart along thecircumference of the device, etc.).

FIG. 13B illustrates an example embodiment of an intermediate section1342 comprising a straight strut 125 and two elongation struts 137comprising openings. During compaction, the openings of the elongationstruts 137 may collapse, thereby increasing the length of the elongationstruts 137. In an example embodiment illustrated in FIG. 13B, uponcompaction the straight strut 125 would maintain length, the middleelongation strut 137 would increase in length somewhat, and the topelongation strut 137 would increase in length the most. The portions ofthe distal section attached to the strut 125 and elongation struts wouldbe differentiated, which may provide a good compaction profile. Forexample, referring again to FIG. 10C, the rings assemblies in the distalsection 106 would be longitudinally spaced when compacted, and also maybe less prone to tangling upon expansion.

FIGS. 14A-14F illustrate example embodiments of distal sections that maybe incorporated into the devices described herein. FIGS. 14A-14Dillustrate example embodiments of distal sections 1461, 1462, 1463, 1464that may be shaped to form a flower portion, for example as describedherein with respect to FIGS. 5A-9B. FIG. 14A illustrates an exampleembodiment of a distal section 1461 comprising a plurality of openfour-sided cells 141 including an internal strut 142. The internalstruts 142 may provide increased surface area when the distal section1461 acts as a scaffolding to inhibit herniation of objects out of theneck of an aneurysm and/or may help the distal section 1461 to form thefurther expanded or substantially planar configuration. FIG. 14Billustrates another example embodiment of a distal section 1462comprising a plurality of open four-sided cells 141 including aninternal strut 142. The internal struts 142 may provide increasedsurface area when the distal section 1462 acts as a scaffolding toinhibit herniation of objects out of the neck of an aneurysm and/or mayhelp the distal section 1462 to form the further expanded orsubstantially planar configuration. The distal section 1462 includesasymmetric cells 141, which may expand to a greater diameter and coveraneurysms having wide necks or to reduce the effective neck size. FIG.14C illustrates another example embodiment of a distal section 1463comprising a plurality of open four-sided cells 141 including aninternal strut 142. The internal struts 142 may provide increasedsurface area when the distal section 1463 acts as a scaffolding toinhibit herniation of objects out of the neck of an aneurysm and/or mayhelp the distal section 1463 to form the further expanded orsubstantially planar configuration. The distal section 1463 includesdisparate asymmetric cells 141, which may expand to a greater diameterand cover aneurysms having wide necks and/or which may provide a goodcompaction profile. The distal section 1463 includes cells 141 connectedto the intermediate section (illustrated as three struts) at the tips ofthe cells 141, which may provide a good compaction profile. FIG. 14Dillustrates another example embodiment of a distal section 1464comprising a plurality of open six-sided cells 143 including an internalstrut 142. The internal struts 142 may provide increased surface areawhen the distal section 1464 acts as a scaffolding to inhibit herniationof objects out of the neck of an aneurysm and/or may help the distalsection 1464 to form the further expanded or substantially planarconfiguration. The distal section 1464 includes six-sided cells 143,which may expand to a greater diameter and cover aneurysms having widenecks and/or which may aid expansion into the further expandedconfiguration. The distal section 56 of FIG. 5A is an example embodimentof the distal section 1461 in an expanded or further expanded state. Thedistal sections 1462, 1463, 1464 may have a similar shape (e.g.,substantially planar) in the expanded or further expanded state, forexample with differences such as, for example, different diameters, peaksharpnesses, etc.

FIG. 14E illustrates an example embodiment of a distal section 1465comprising a plurality of ring assemblies. As described with respect toFIGS. 10A-10C, the ring assemblies may each comprise a plurality ofrings 107, 108, 109 having different flexibility, diameter, etc. In someembodiments, a distal section 1465 comprising a plurality of ringassemblies may be less prone to puncturing vasculature than the peaks ofcells of flower portions. In some embodiments, a distal section 1465comprising a plurality of ring assemblies may be easy to deploy, forexample because the deployment force acts on different non-alignedangles. The distal section 106 of FIG. 10A is an example embodiment ofthe distal section 1465 in an expanded or further expanded state.

FIG. 14F illustrates an example embodiment of distal section 1466comprising a unit cell of a proximal section having a hybrid celldesign. The distal section 1466 comprises forward connected peaks 144,forward free-peaks 145, and reverse connected peaks 146, 147, 148. Thedistal section 1466 does not include any reverse free-peaks, which mayenhance the ability of the distal section 1466 to be retrieved into acatheter. In some embodiments, the unit cell design of the distalsection may be the same as the unit cell design of the proximal section.For example, the distal section 1466 may be combined with the proximalsection 1226 of FIG. 12F or the proximal section 1227 of FIG. 12G. Insome embodiments, the intermediate section may comprise long strutsconnecting the distal-most unit cell. In some embodiments, theintermediate section may comprise a unit cell.

In some embodiments, the intermediate section and/or the distal sectioncomprises an extension or another generation of the cell pattern of theproximal section that has been reshaped, for example into an approximatesemi-sphere, umbrella, or reverse umbrella extending radially outwardfrom the proximal section and then radially inward or outward towardsthe distal end. FIG. 15 illustrates an example embodiment of anintermediate section and distal section 151 comprising an extension ofthe cell pattern of the proximal section that has been reshaped into anapproximate semi-sphere or umbrella shape. The device 151 may also be ina reverse-umbrella shape. In some embodiments, the section 151 may beeasier to manufacture than other sections described herein. In someembodiments, the section 151 may be placed at a bifurcation of ananeurysm as described herein (e.g., at FIG. 7A and FIG. 7B). In someembodiments, the section 151 may be placed at least partially within afundus of an aneurysm (e.g., at FIG. 11 and FIGS. 18A-20E). In certainsuch embodiments, the proximal section of the device may allow perfusionto efferent vessels.

In the embodiment illustrated in FIG. 15, the demarcation between theintermediate section and the distal section is not explicit. In someembodiments, the proximal half of the section 151 may be considered theintermediate section. In some embodiments, the portion of the section151 that does not act as a scaffolding to inhibit herniation of objectsout of the neck of an aneurysm may be considered the intermediatesection. In some embodiments, the portion of the section 151 that allowsperfusion to efferent vessels may be considered the intermediatesection. In some embodiments, the intermediate section may at leastpartially overlap with the distal section. In some embodiments, theentire section after the proximal section may be considered the distalsection (e.g., the length of the intermediate section is zero).

Any combination or permutation of the proximal, intermediate, and distalsections described herein, whether in FIGS. 12A-15 or elsewhere (e.g.,the proximal section 222 of FIG. 22A, the proximal section 224 of FIG.22B, the proximal section 226 of FIG. 22C, the distal section 236 ofFIG. 23), may be used in an intraluminal device for aneurysm treatment,clot retrieval, or other uses. For example, referring again to FIG. 5A,the proximal section 52 is the proximal section 1221 of FIG. 12A, theintermediate section 54 is a plurality of struts 125 of FIG. 13A (twostruts 55), and the distal section 56 is the distal section 1461 of FIG.14A. For another example, referring again to FIG. 10C, the proximalsection 102 is the proximal section 1225 of FIG. 12E, the intermediatesection 104 is a plurality of struts 125 of FIG. 13A (three struts 105),and the distal section 106 is the distal section 1464 of FIG. 14D. Itwill be appreciated that a large number of permutations are possible byselecting a proximal section from amongst FIGS. 12A-12G (or equivalentsor modifications thereof), selecting an intermediate section fromamongst FIG. 13A and FIG. 13B (or equivalents or modifications thereof),selecting a distal section from amongst FIGS. 14A-14F (or equivalents ormodifications thereof), and/or selecting an intermediate section anddistal section from FIG. 15 (or equivalents or modifications thereof).Thus, the devices disclosed herein are not limited to any explicitlyillustrated embodiment.

The proximal section, the intermediate section, and the distal sectionmay be integrally formed from the metallic tube or sheet and not cutaway from each other. In embodiments in which all sections of the deviceare integrally fabricated by being cut from the same tube or sheet, thedevice is of single-piece construction. Single-piece construction mayallow for easier manufacturing. In some embodiments, some or all of theproximal section, the intermediate section, and the distal section maybe formed separately, and the parts coupled together (e.g., by beingwelded, glued, adhered, mechanically crimped, mechanically swaged,braided, physical vapor deposited, chemical vapor deposited, etc.). Forexample, the proximal section and the distal section may be cut from atube or a sheet and then coupled (e.g., welded, glued, adhered,mechanically crimped, mechanically swaged, braided, physical vapordeposited, chemical vapor deposited, etc.) by the struts (e.g., welded,glued, adhered, mechanically crimped, mechanically swaged, braided,physical vapor deposited, chemical vapor deposited, etc.). Certainportions of the proximal section, the intermediate section, and thedistal section may be formed separately. For example, a proximal endsegments may be cut from a tube or a sheet and then coupled (e.g.,welded, glued, adhered, mechanically crimped, mechanically swaged,braided, physical vapor deposited, chemical vapor deposited, etc.) byconnectors. In some embodiments, the distal section may comprisedifferent material than the proximal section. For example, the distalsection may comprise platinum, platinum-iridium, or a polymer and theproximal section may comprise Nitinol or CoCr alloy. Other combinationsof materials are also possible. Separate or multiple-piece constructionmay allow for independent selection of materials that are suited for theintended use. In some embodiments, some parts of the distal section(e.g., peaks) are integrated with the proximal section (e.g., being cutfrom the same tube or sheet) and other parts of the distal section(e.g., struts between peaks) are formed separately from the proximalportion and are attached (e.g., welded, glued, adhered, mechanicallycrimped, mechanically swaged, braided, physical vapor deposited,chemical vapor deposited, etc.). Combination construction may alloweasier fabrication than purely multiple-piece construction and also somematerial selection advantages.

Referring again to FIG. 9A and FIG. 9B, but also applicable to FIGS.12A-15, the cut may be defined by features such as filament width w,lengths l₁ (e.g., length of a proximal end finger), l₂ (e.g., length ofa proximal end segment including fingers), l₃ (e.g., length of aconnector coupling proximal section unit cells, length between proximalsection unit cells), l₄ (e.g., length of a proximal section unit cell,length of a proximal section unit cell portion), l₅ (e.g., length ofintermediate section, length between proximal section and distalsection), l₆ (e.g., length between distal section inward-facing peaks),l₇ (e.g., length of the distal section in a partially expanded state),heights h₁ (e.g., height of proximal end segment including fingers), h₂(e.g., height of a proximal end finger in a first dimension), h₃ (e.g.,height between proximal end fingers), h₄ (e.g., height of a proximal endfinger in a second dimension), h₅ (e.g., height between free peaks), h₆(e.g., height of distal section in the expanded state), and angles a₁(e.g., angle of taper), a₂ (e.g., angle of reverse free peak, angle ofreverse connected peaks), a₃ (e.g., angle of at least partiallylongitudinally projecting filaments), a₄ (e.g., angle of forward freepeaks, angle of forward connected peaks), and a₅ (e.g., angle of distalend forward peaks). It will be appreciated that, for different patterns,the configuration and dimensions of certain features will also bedifferent. For example, some cuts may not include certain of thedimensions described herein.

In some embodiments, the width w is between about 0.02 mm and about 0.2mm. In some embodiments, the width w is between about 0.03 mm and about0.1 mm. In some embodiments, the width w is about 0.05 mm. Other widthsw are also possible. The width w of the filaments may be uniformthroughout the device 100, or may vary depending on location. Forexample, struts connecting unit cells may be wider than struts withinunit cells.

In some embodiments, the tapered length l_(t) is between about 1.5 mmand about 20 mm. In some embodiments, the tapered length l_(t) isbetween about 4 mm and about 15 mm. Other tapered lengths l_(t) are alsopossible. In some embodiments, the effective length l_(e) is betweenabout 5 mm and about 40 mm. In some embodiments, the effective lengthl_(e) is between about 10 mm and about 30 mm. In some embodiments, theeffective length l_(e) is between about 10 mm and about 20 mm. Othereffective lengths l_(e) are also possible.

In some embodiments, the length l₂ is between about 0.01 mm and about 2mm. In some embodiments, the length l₂ is between about 0.05 mm andabout 0.75 mm. Other lengths l₂ are also possible. In some embodiments,the length l₃ is between about 0.01 mm and about 3 mm. In someembodiments, the length l₃ is between about 0.1 mm and about 0.5 mm.Other lengths l₃ are also possible. In some embodiments, the length l₄is between about 1 mm and about 7 mm. In some embodiments, the length l₄is between about 2 mm and about 5 mm. Other lengths l₄ are alsopossible. In some embodiments, the length l₅ is between about 0 mm andabout 8 mm. In some embodiments, the length l₅ is between about 0 mm andabout 10 mm. In some embodiments, the length l₅ is between about 0 mmand about 6 mm. In some embodiments, the length l₅ is between about 6 mmand about 10 mm. In some embodiments, the length l₅ is about 8 mm. Insome embodiments, the length l₅ is between about 0 mm and about 5 mm.Other lengths l₅ are also possible. In some embodiments, the length l₆is between about 0.01 mm and about 3 mm. In some embodiments, the lengthl₆ is between about 0.05 mm and about 0.5 mm. Other lengths l₆ are alsopossible. In some embodiments, the length l₇ is between about 0.5 mm andabout 10 mm. In some embodiments, the length l₇ is between about 1.5 mmand about 6 mm. Other lengths l₇ are also possible.

In some embodiments, the height h₁ is between about 0.01 mm and about0.75 mm. In some embodiments, the height h₁ is between about 0.01 mm andabout 0.5 mm. Other heights h₁ are also possible. In some embodiments,the height h₄ is between about 0.01 mm and about 0.25 mm. In someembodiments, the height h₄ is between about 0.01 mm and about 0.1 mm.Other heights h₄ are also possible. In some embodiments, the height h₅is between about 0.25 mm and about 6 mm. In some embodiments, the heighth₅ is between about 0.5 mm and about 3 mm. Other heights h₅ are alsopossible. In some embodiments, the height h₆ is between about 1.5 mm andabout 6 mm in the expanded state. In some embodiments, the height of thedistal section is between about 3 mm and about 15 mm in the furtherexpanded state. Other heights h₆ and heights of the distal section inthe further expanded state are also possible.

The dimensions described herein, including for example dimensionsdescribed with respect to FIG. 9A, may be uniform throughout theproximal section 102 of the device 100, or may vary depending onlocation (e.g., increasing from proximal to distal, decreasing fromproximal to distal, combinations thereof, and the like). Dimensions maybe selected, for example, to accommodate certain vasculature, forflexibility, for wall conformance, etc.

In some embodiments, other of the dimensions described herein may beuniform throughout the proximal section of the device, or may varydepending on location (e.g., increasing from proximal to distal,decreasing from proximal to distal, combinations thereof, and the like).Dimensions may be selected, for example, to accommodate certainmicrovasculature, for flexibility, for wall conformance, etc. In someembodiments, a reduced number of the connectors coupling proximal endsegments may increase the flexibility of the proximal section of thedevice.

After cutting the tube or the sheet, the device may be reshaped and thedevice may be heat treated to impart shape setting to at least thedistal section and/or the proximal section 122. The shape settingprocess may include several steps comprising, for example, successivelyshapes using appropriate tooling to stretch and confine the cut tubeinto a new shape during the heat treatment. At the end of the each heattreatment step, the cut tube or sheet assumes the shape in which it wasconfined during the heat treatment process. The final shape (e.g.,further expanded state) and size may obtained by several such steps. Insome embodiments in which a cut sheet is rolled to form a tube, theremay be a slit along the length of the device (e.g., the opposite sidesof the sheet are not joined), or the edge(s) can be welded or otherwisejoined together by other methods to form a complete tubular profile. Incertain such embodiments, the sides may be in contact or spaced.

FIG. 16 illustrates an example embodiment of a vascular remodelingdevice 160 comprising a scaffolding distal section 166 that is wovenfrom a plurality of filaments rather than being cut from a tube or asheet. The device 160 comprises a proximal section 162, an intermediatesection 164, and a distal section 166. The distal section 166 has afurther expanded state, and the device 160 acts like an umbrella.

The intermediate section 164 comprises a plurality of struts 165. Thestruts 165 may be straight, curved, or otherwise shaped. In someembodiments, the struts 165 have a substantially rectangular or flatcross section (e.g., embodiments, in which the struts 165 compriseribbons or uncut portions of a metallic tube or sheet). In someembodiments, the struts 165 have a substantially round (e.g., circular,elliptical, ovoid) cross section (e.g., embodiments, in which the struts165 comprise round filaments). In the example embodiment illustrated inFIG. 16, the struts 165 comprise a plurality of wires twisted together.The struts 165 couple the proximal section 162 to the distal section166. In some embodiments, the plurality of struts 165 comprises twostruts 165. In some embodiments, the plurality of struts 165 comprisesgreater than two struts 165. In some embodiments, the plurality ofstruts 165 comprises between about two struts 165 and about twelvestruts 165 (e.g., between about three struts 165 and about eight struts165, three struts 165, four struts 165, five struts 165, six struts 165,seven struts 165, or eight struts 165). Other numbers of struts 165 arealso possible. In certain embodiments, the struts 165 may be equallyspaced and/or oriented on opposite sides of the device 160 (e.g., twostruts 180° apart along the circumference of the device 160, threestruts 120° apart along the circumference of the device 160, four struts90° apart along the circumference of the device 160, etc.). When thedevice 160 is placed at a bifurcation, the intermediate section 164allows flow to efferent vessels because the struts 165 do not blockfluid flow. In some embodiments, the filaments in the intermediatesection 164 have a width between about 0.02 mm and about 0.2 mm. In someembodiments, the filaments in the intermediate section 104 have a widthbetween about 0.0035 mm and about 0.005 mm. In some embodiments, thefilaments in the intermediate section 104 have a width between about0.03 mm and about 0.1 mm. In some embodiments, the filaments in theintermediate section 104 have a width of about 0.05 mm. Other widths arealso possible. It will be appreciated that in embodiments in which thestruts 165 each comprise a plurality of filaments, the width of thestruts may be approximately the width of the filaments multiplied by thenumber of filaments. The intermediate section 164 has a length l_(i). Insome embodiments, the length l_(i) is between about 0 mm and about 6 mm.In some embodiments, the length l_(i) is between about 0 mm and about 8mm. In some embodiments, the length l_(i) is between about 0 mm andabout 10 mm. In some embodiments, the length l_(i) is between about 6 mmand about 10 mm. In some embodiments, the length l_(i) is about 8 mm.Other lengths l_(i) are also possible.

In some embodiments, the proximal section 162 has a first diameter andthe distal section 166 has a second diameter greater than the firstdiameter (e.g., due to the further expansion or weaving pattern), whichmay cause the struts 165 to be angled or curved outwards from thelongitudinal axis defined by the proximal section 162. In someembodiments, the proximal section 162 has a round (e.g., circular,elliptical, or ovoid) cross section. In some embodiments, the proximalsection 162 includes filaments having a substantially rectangular orflat cross section (e.g., embodiments in which the proximal section 162comprises ribbons or uncut portions of a metallic tube or sheet). Insome embodiments, the proximal section 162 includes filaments having asubstantially round (e.g., circular, elliptical, ovoid) cross section(e.g., embodiments, in which the proximal section 162 comprises roundfilaments). In some embodiments, the proximal section 162 comprises aplurality of woven filaments (e.g., as illustrated in FIG. 16), whichmay provide good flexibility. When the device 160 is placed at abifurcation, the proximal section 162 provides anchoring of the device160 in the afferent vessel. The proximal section 162 may also facilitatedelivery, positioning, and/or retrieval of the device 160. In someembodiments, the proximal section 162 has a foreshortening rate lessthan about 20%. In some embodiments in which the struts 165 comprisewire filaments, the proximal section 162 comprises the same wirefilaments or the same type of wire filaments as the struts 165. In someembodiments, the filaments in the proximal section 162 have a widthbetween about 0.02 mm and about 0.2 mm. In some embodiments, thefilaments in the proximal section 162 have a width between about 0.0035mm and about 0.005 mm. In some embodiments, the filaments in theproximal section 162 have a width between about 0.03 mm and about 0.1mm. In some embodiments, the filaments in the proximal section 162 havea width of about 0.05 mm. Other widths are also possible. The proximalsection 162 has a length l_(p). In some embodiments, the length l_(p) isbetween about 6.5 mm and about 60 mm. In some embodiments, the lengthl_(p) is between about 14 mm and about 45 mm. In some embodiments, thelength l_(p) is between about 5 mm and about 40 mm. In some embodiments,the length l_(p) is between about 10 mm and about 30 mm. In someembodiments, the length l_(p) is between about 10 mm and about 20 mm. Insome embodiments, the length l_(p) is between about 10 mm and about 14mm (e.g., about 12 mm). Other lengths l_(p) are also possible.

The distal section 166 may have an umbrella shape. The distal section166 allows for safe and controlled placement of coils, and can bedesigned to support a certain packing density of coil. Upon deployment,the distal section 166 can be placed at the neck of an aneurysm and cancover the neck enough that aneurysm filling devices can still bepositioned inside the aneurysm. In some embodiments, the filaments inthe distal section 166 have a width between about 0.02 mm and about 0.2mm. In some embodiments, the filaments in the distal section 166 have awidth between about 0.0015 mm and about 0.002 mm. In some embodiments,the filaments in the distal section 166 have a width between about 0.03mm and about 0.1 mm. In some embodiments, the filaments in the distalsection 166 have a width of about 0.05 mm. Other widths are alsopossible. In some embodiments, thinner filaments can be more atraumaticthan large filaments. The distal section 166 has a diameter d_(d). Insome embodiments, the diameter d_(d) is between about 1.5 mm and about 7mm. In some embodiments, the diameter d_(d) is between about 1.5 mm andabout 6 mm. In some embodiments, the diameter d_(d) is between about 3mm and about 15 mm. Other diameters d_(d) are also possible.

The distal section 166 comprises a plurality of perforations or cells167 between the filaments. In some embodiments, the cells have a size ofabout 1 mm×about 1.2 mm. Other cell sizes and relative dimensions (e.g.,equal length sides) are also possible. Other cell shapes (e.g.,quadrilateral, parallelogram, rhombus, rectangle, square, hexagon, etc.)are also possible. In certain embodiments, a percentage of the distalsection 166 covered by the filaments is between about 25% and about 40%.In certain embodiments, a percentage of the distal section 166 coveredby the cells 167 is between about 60% and about 75%. Other porosities ofthe distal section 166 are also possible. In some embodiments, thedistal section 166 may comprise a cover (e.g., a polymer cover). Incertain embodiments, a porosity between about 60% and about 75% or loweror a cover may help to divert fluid flow away from an aneurysm, as wellas providing more scaffolding support for embolic material in theaneurysm. In some embodiments, the distal section 166 comprises one ormore of a mesh, a covering, additional filaments, etc. As describedherein, for example with respect to FIG. 9A and FIG. 9B, heat treatmentmay be used to shape set the distal section 166 in the umbrella shapeand the distal section 166 can have a further expanded shape.

In some embodiments, the device 160 comprises a self-expanding (e.g.,CoCr alloy, such as polyglycolic acid and polylactic acid, etc.) and/ora shape-memory material (e.g., comprising Nitinol, shape memorypolymers, etc.), thereby causing the device 160 to be self-expandingunder certain conditions (e.g., not restrained by a catheter,temperature modified, etc.). In some embodiments, the proximal section162, the intermediate section 164, and/or the distal section 166 maycomprise different materials (e.g., in addition to having differentthicknesses as described herein). The device 160 can assume a lowprofile compressed state (e.g., confined within a catheter) fordelivery. Upon deployment from the catheter, the device 160 expands(e.g., self-expands) from the compressed state to an expanded state. Thedistal section 166 expands (e.g., self-expands) to a further expandedstate.

In some embodiments, the device 160 comprises a radiopaque material suchas platinum, platinum-iridium, and/or tantalum (e.g., being at leastpartially formed from the radiopaque material (e.g., having a radiopaquelayer, consisting of a radiopaque material), including radiopaquemarkers). For example, the struts 165 may comprise radiopaque markers.For another example, certain segments of the distal section 166 maycomprise radiopaque markers. For yet another example, the struts 165 andcertain segments of the distal section 166 may comprise radiopaquemarkers. For still another example, certain segments of the proximalsection 164 may comprise radiopaque markers. It will be appreciated thatthe amount and type of radiopaque material used may depend, inter alia,on price, desired level of radiopacity, mechanical properties of theradiopaque material, and corrosion properties of the radiopaquematerial.

In some embodiments, the device 160 is configured to be positioned at ajunction of a bifurcation (e.g., a neurovascular bifurcation (e.g., thebasilar tip area)) comprising at least one afferent vessel, efferentvessels, and an aneurysm having a fundus and a neck. For example, insome embodiments, the proximal section 162 is suitably dimensioned tofit in an afferent vessel of a bifurcation (e.g., having a diameterbetween about 3 mm and about 15 mm, having a diameter between about 1.5mm and about 8 mm, having a diameter between about 1.5 mm and about 7mm, having a diameter between about 1.5 mm and about 6 mm, having adiameter less than about 15 mm, having a diameter greater than about 1mm). In some embodiments, the device 160 is configured to act as ascaffolding to inhibit or prevent herniation or prolapse of objects(e.g., embolization coils, thrombi, etc.) out of a neck of an aneurysm.For another example, in some embodiments, the distal section 166 isdense enough that such objects cannot pass. In some embodiments, arelative amount of the distal section 56 or a portion thereof occupiedby the filaments of the distal section 56 is between about 3% and about25%. In some embodiments, a relative amount of the distal section 56 ora portion thereof occupied by the filaments of the distal section 56 isbetween about 3% and about 15%. In some embodiments, a relative amountof the distal section 56 or a portion thereof occupied by the filamentsof the distal section 56 is at least about 5%. For another example, insome embodiments, the distal section 166 allows insertion of embolicmaterial therethrough (e.g., through the cells 167). In someembodiments, the device 160 is configured to permit perfusion of fluid(e.g., blood) to efferent vessels of a bifurcation. For yet anotherexample, in some embodiments, the intermediate section is substantiallydevoid of a covering, mesh, or other material between the struts 165,thereby allowing fluid to flow substantially unimpeded.

FIG. 17 illustrates an example embodiment of a vascular remodelingdevice 170 comprising a proximal section 172, an intermediate section174 comprising a plurality of struts 175, and a distal section 176. Asdescribed herein, for example with respect to FIG. 16, the distalsection 176 has a further expanded state, and the device 170 acts likean umbrella in that upon expansion the edges of the distal section 176move longitudinally relative to the center of the distal section 176 andthe edges of the distal section 176 move radially outward upon thelongitudinal movement. In contrast to the device 160, the device 170comprises a proximal section 172 and/or a distal section 176 comprisingcells 177 cut from a sheet or a tube and then coupled to theintermediate section 174. The proximal section 172 has an effectivelength l_(p) (e.g., a tapered portion is not shown, but may be proximalto the illustrated proximal section 172). In some embodiments, thelength l_(p) is between about 6.5 mm and about 60 mm. In someembodiments, the length l_(p) is between about 14 mm and about 45 mm. Insome embodiments, the length l_(p) is between about 5 mm and about 40mm. In some embodiments, the length l_(p) is between about 10 mm andabout 30 mm. In some embodiments, the length l_(p) is between about 10mm and about 20 mm. In some embodiments, the length l_(p) is betweenabout 10 mm and about 14 mm (e.g., about 12 mm). Other lengths l_(p) arealso possible. The intermediate section 174 has a length l_(i). In someembodiments, the length l_(i) is between about 0 mm and about 5 mm. Insome embodiments, the length l_(i) is between about 0 mm and about 6 mm.In some embodiments, the length l_(i) is between about 0 mm and about 8mm. In some embodiments, the length l_(i) is between about 0 mm andabout 10 mm. In some embodiments, the length l_(i) is between about 6 mmand about 10 mm (e.g., about 8 mm). Other lengths l_(i) are alsopossible.

The distal section 176 has an expanded or further expanded diameterd_(d) that is greater than the expanded diameter d_(p) of the proximalsection 172. In some embodiments, the diameter d_(d) is between about1.5 mm and about 6 mm. Other diameters d_(d) are also possible. In someembodiments, the diameter d_(p) is between about 3 mm and about 15 mm.Other diameters d_(p) are also possible.

FIGS. 18A-18E illustrate an example embodiment of a method for treatingan aneurysm 20 using a vascular remodeling device (e.g., the devices 50,100, 160, 170 described herein) at a confluence of afferent and efferentvessels or “junction” at a bifurcation having an aneurysm 20. In someembodiments, the vessels are neurovascular or cranial. FIG. 18A shows acatheter 180 (e.g., microcatheter) positioned in the afferent vessel andprojecting into the bifurcation. FIG. 18B shows the distal section 186being deployed at least partially within the fundus of the aneurysm 20(e.g., by being pushed out with a plunger, by retracting the catheterwhile the device remains stationary, etc.) and expanding as describedherein. In some embodiments, the distal section 186 abuts the neck ofthe aneurysm 20 but is not inserted in the aneurysm 20. In someembodiments, the device comprises a self-expanding and/or a shape-memorymaterial that automatically expands (e.g., self-expands) towards anuncompressed state or does so upon the application of warm fluid (e.g.,saline). As shown in FIG. 18C and FIG. 18D, a second catheter 181 isused to insert embolic coils 62 in the aneurysm 20 while the proximalsection 182 of the device remains in the catheter 180. It will beappreciated that the embolization coils 62 may be a single embolizationcoil or other embolic material (e.g., embolic fluid such as Onyx®,available from ev3). The device acts as a scaffolding to inhibit orprevent herniation or prolapse of objects such as the embolization coils62 and/or thrombi out of the aneurysm 20. The second catheter 181 isthen removed, and the catheter 180 is removed to deploy the proximalsection 182 in the afferent vessel. The device also allows perfusion offluid (e.g., blood) from the afferent vessel(s) to the efferentvessel(s).

FIGS. 19A-19E illustrate another example embodiment of a method fortreating an aneurysm 20 using a vascular remodeling device (e.g., thedevices 50, 100, 160, 170 described herein) at a confluence of afferentand efferent vessels or “junction” at a bifurcation having an aneurysm20. In some embodiments, the vessels are neurovascular or cranial. FIG.19A shows a catheter 180 (e.g., microcatheter) positioned in theafferent vessel and projecting into the bifurcation. FIG. 19B shows thedistal section 186 being deployed at least partially within the fundusof the aneurysm 20 (e.g., by being pushed out with a plunger, byretracting the catheter while the device remains stationary, etc.) andexpanding as described herein. In some embodiments, the distal section186 abuts the neck of the aneurysm 20 but is not inserted in theaneurysm 20. In some embodiments, the device comprises a self-expandingand/or a shape-memory material that automatically expands (e.g.,self-expands) towards an uncompressed state or does so upon theapplication of warm fluid (e.g., saline). FIG. 19C shows the entiredevice including the proximal section 182 being released from thecatheter 180 and the catheter 180 being removed prior to inserting asecond catheter 181. The proximal section 182 anchors the device in theafferent vessel. As shown in FIG. 19C and FIG. 18D, a second catheter181 is used to insert embolic coils 62 in the aneurysm 20. It will beappreciated that the embolization coils 62 may be a single embolizationcoil or other embolic material (e.g., embolic fluid such as Onyx®,available from ev3). The device acts as a scaffolding to inhibit orprevent herniation or prolapse of objects such as the embolization coils62 and/or thrombi out of the aneurysm 20. The second catheter 181 isthen removed. The device also allows perfusion of fluid (e.g., blood)from the afferent vessel(s) to the efferent vessel(s).

FIGS. 20A-20C illustrate yet another example embodiment of a method fortreating an aneurysm 20 using a vascular remodeling device (e.g., thedevices 50, 100, 160, 170 described herein) at a confluence of afferentand efferent vessels or “junction” at a bifurcation having an aneurysm20. In some embodiments, the vessels are neurovascular or cranial. FIG.20A shows a catheter 180 (e.g., microcatheter) positioned in theafferent vessel and projecting into the bifurcation. FIG. 20B shows thedistal section 186 being deployed at least partially within the fundusof the aneurysm 20 (e.g., by being pushed out with a plunger, byretracting the catheter while the device remains stationary, etc.) andexpanding as described herein. In some embodiments, the distal section186 abuts the neck of the aneurysm 20 but is not inserted in theaneurysm 20. In some embodiments, the device comprises a self-expandingand/or a shape-memory material that automatically expands (e.g.,self-expands) towards an uncompressed state or does so upon theapplication of warm fluid (e.g., saline). FIG. 20C shows the entiredevice including the proximal section 182 being released from thecatheter 180 and the catheter 180 being removed prior. The proximalsection 182 anchors the device in the afferent vessel. In contrast tothe methods described with respect to FIGS. 18A-19E, a second catheteris not used to insert embolic material in the aneurysm 20. Rather, theembodiment of the device used in the method of FIGS. 20A-20C eithercomprises a porosity or covering that can divert fluid flow. The devicealso allows perfusion of fluid (e.g., blood) from the afferent vessel(s)to the efferent vessel(s).

Certain devices described herein may be advantageously used to treataneurysms having a neck ratio (a ratio of fundus width to neck width)greater than about 2 to 1 and/or a neck width greater than about 4 mm.In treatment of such aneurysms, embolization coils may be prone toherniating into parent vessels because the size and/or shape of theaneurysm is not conducive to maintaining the coils in their insertedlocus. In some embodiments, embolization coils are inserted in thefundus of the aneurysm after positioning a generally spherical device sothat the embolization coils do not have an opportunity to herniate. Itwill be appreciated that certain devices described herein may also beused to treat aneurysms having a neck ratio less than about 2 to 1and/or a neck width less than about 4 mm. In some embodiments,embolization coils are inserted in the fundus of the aneurysm beforepositioning a generally spherical device.

In some embodiments in which embolic material was previously inserted inan aneurysm but has herniated, certain devices described herein may beused as a “rescue device” to push the herniated material back into theaneurysm and to act as a scaffolding to inhibit or prevent furtherherniation or prolapse of the embolic material. In certain suchembodiments, deployment of such devices may advantageously avoidtraversal of the junction comprising the herniated material by wires ora catheter (e.g., there is no need to traverse wires or a catheter pastthe junction into an efferent vessel for positioning of the device as isgenerally needed to position tubular devices such as the devices 42, 44illustrated in FIG. 4B and FIG. 4C), which may cause the herniatedmaterial to become tangled and/or dislodged and which may cause ruptureof the aneurysm.

Certain devices described herein may also be useful to treat or inhibitischemic stroke and other diseases by being used to retrieve thrombi orblood clots. U.S. patent application Ser. No. 12/918,795, filed on Feb.20, 2009 and published as U.S. Patent Pub. No. 2011/0060212 on Mar. 10,2011, describes methods of using devices having porous proximal sectionsfor clot retrieval, and is hereby incorporated by reference in itsentirety. The devices described herein comprise a distal sectionconfigured to act as a scaffolding to inhibit herniation of objects outof an aneurysm, and the distal section may also be used for distalprotection during retrieval of soft or firm clots or clot fragmentswhile allowing continued blood flow through the vessel due to the distalsection not preventing fluid flow.

FIG. 21A illustrates an example embodiment of a method of capturing aclot 210 using a device 50 comprising a distal section 56 and a proximalsection 52 within a catheter 180. The distal section 56 comprises aflower portion as described herein, for example with respect to FIGS.5A-9B. In some embodiments, the distal end of the catheter 180 at leastpartially containing the device 50 in a compressed state is placeddistal to the clot 210 as determined by the direction of blood flowindicated by the arrow 214. The catheter 180 is then retracted relativeto the device 50. Upon exposure from the catheter 180, the device 50expands (e.g., self-expands) from the compressed state to an expandedstate. As described herein, the distal section 56 may expand (e.g.,self-expand) to a further expanded state. In the further expanded state,the distal section 56 has a larger diameter than the proximal section52. The proximal section 52 expands alongside the clot 210 and thedistal section 56 expands distal to the clot 210. The flexibility of theproximal section 52 may be low to enhance resistance to clot 210 force(e.g., to cause the clot 210 to squish around the filaments). The clot210 at least partially squeezes between the cells of the proximalsection 52 and becomes lodged therein. In some embodiments, the distalsection 56 expands to approximately the diameter of the vesselcontaining the clot. In this manner, the scaffolding of the distalsection 56 can catch any clots or clot fragments that may be too smallto be caught by the proximal section 52. The diameter and flexibility ofthe distal section 56 can provide good wall apposition to leave little(e.g., no) space for clot small clots or clot fragments (e.g., the clotfragment 212) to flow past while still allowing blood to flow throughthe vessel. Once the clot 210 and clot fragments are caught in thedevice 50, the device 50 is retrieved back into the catheter 180, forexample by distally advancing the catheter 180 over the device 50 orpulling the device 50 into the catheter 180. In some embodiments,catheter 180 may be a guide catheter configured to receive the device 50and clot 210 and/or clot fragments. During retrieval, the taperedportions 53 cause the device 50 to be radially compressed back into thecatheter 180 along with the clot 210 and clot fragment 212. If pieces ofthe clot 210 break off during retrieval (e.g., the clot fragment 212),they can be caught in the distal section 56, which is the last portionof the device to be compressed into the catheter 180. The catheter 180may then be removed from the body. The distal section 56 thus providesintegrated embolic protection during the clot 210 retrieval procedure(e.g., nor requiring a separate filter or other embolic protectiondevice). In some embodiments in which the device 50 is formed from asheet, the edges of the sheet are not coupled in at least the proximalsection 52 to leave a slot, and the edges may overlap to form a coiledconfiguration when viewed from the distal end to enhance interactionwith the clot 210 (e.g., by springing open upon release from thecatheter 180 and/or by acting as jaws that clamp down on the clot 210during retrieval of the device 50). In some embodiments in which thedevice 50 is formed from a tube, the proximal section 52 comprises alongitudinal slot to form two edges, and the edges may overlap to form acoiled configuration when viewed from the distal end to enhanceinteraction with the clot 210 (e.g., by springing open upon release fromthe catheter 180 and/or by acting as jaws that clamp down on the clot210 during retrieval of the device 50). In some embodiments in which theclot 210 is proximate to a bifurcation, the diameter of the distalsection 56 may substantially span (e.g., span) the junction of abifurcation, allowing perfusion to efferent vessels.

FIG. 21B illustrates an example embodiment of a method of capturing aclot 210 using a device 100 comprising a distal section 106 and aproximal section 102 within a catheter 180. The distal section 106comprises a plurality of rings as described herein, for example withrespect to FIGS. 10A-11. In some embodiments, the distal end of thecatheter 180 at least partially containing the device 100 in acompressed state is placed distal to the clot 210 as determined by thedirection of blood flow indicated by the arrow 214. The catheter 180 isthen retracted relative to the device 100. Upon exposure from thecatheter 180, the device 100 expands (e.g., self-expands) from thecompressed state to an expanded state. As described herein, the distalsection 106 may expand (e.g., self-expand) to a further expanded state.In the further expanded state, the distal section 106 has a largerdiameter than the proximal section 102. The proximal section 102 expandsalongside the clot 210 and the distal section 106 expands distal to theclot 210. The flexibility of the proximal section 102 may be low toenhance resistance to clot 210 force (e.g., to cause the clot 210 tosquish around the filaments). The clot 210 at least partially squeezesbetween the cells of the proximal section 102 and becomes lodgedtherein. In some embodiments, the distal section 106 expands toapproximately the diameter of the vessel containing the clot. In thismanner, the scaffolding of the distal section 106 can catch any clots orclot fragments that may be too small to be caught by the proximalsection 102. The diameter and flexibility of the distal section 106 canprovide good wall apposition to leave little (e.g., no) space for clotsmall clots or clot fragments (e.g., the clot fragment 212) to flow pastwhile still allowing blood to flow through the vessel. Once the clot 210and clot fragments are caught in the device 100, the device 100 isretrieved back into the catheter 180, for example by distally advancingthe catheter 180 over the device 100 or pulling the device 100 into thecatheter 180. During retrieval, the tapered portions 103 cause thedevice 100 to be radially compressed back into the catheter 180 alongwith the clot 210 and clot fragment 212. If pieces of the clot 210 breakoff during retrieval (e.g., the clot fragment 212), they can be caughtin the distal section 106, which is the last portion of the device to becompressed into the catheter 180. The catheter 180 may then be removedfrom the body. The distal section 106 thus provides integrated embolicprotection during the clot 210 retrieval procedure (e.g., nor requiringa separate filter or other embolic protection device). In someembodiments in which the device 100 is formed from a sheet, the edges ofthe sheet are not coupled in at least the proximal section 102 to leavea slot, and the edges may overlap to form a coiled configuration whenviewed from the distal end to enhance interaction with the clot 210(e.g., by springing open upon release from the catheter 180 and/or byacting as jaws that clamp down on the clot 210 during retrieval of thedevice 100). In some embodiments in which the device 100 is formed froma tube, the proximal section 102 comprises a longitudinal slot to formtwo edges, and the edges may overlap to form a coiled configuration whenviewed from the distal end to enhance interaction with the clot 210(e.g., by springing open upon release from the catheter 180 and/or byacting as jaws that clamp down on the clot 210 during retrieval of thedevice 100). In some embodiments in which the clot 210 is proximate to abifurcation, the diameter of the distal section 106 may substantiallyspan (e.g., span) the junction of a bifurcation, allowing perfusion toefferent vessels.

FIG. 21C illustrates an example embodiment of a method of capturing aclot 210 using a device 1510 comprising a distal section 151 and aproximal section 1512 within a catheter 180. The distal section 151comprises a semi-sphere or umbrella shape as described herein, forexample with respect to FIG. 15. In some embodiments, the distal end ofthe catheter 180 at least partially containing the device 1510 in acompressed state is placed distal to the clot 210 as determined by thedirection of blood flow indicated by the arrow 214. The catheter 180 isthen retracted relative to the device 1510. Upon exposure from thecatheter 180, the device 1510 expands (e.g., self-expands) from thecompressed state to an expanded state. As described herein, the distalsection 151 may expand (e.g., self-expand) to a further expanded state.In the further expanded state, the distal section 151 has a largerdiameter than the proximal section 1512. The proximal section 1512expands alongside the clot 210 and the distal section 151 expands distalto the clot 210. The flexibility of the proximal section 1512 may be lowto enhance resistance to clot 210 force (e.g., to cause the clot 210 tosquish around the filaments). The clot 210 at least partially squeezesbetween the cells of the proximal section 1512 and becomes lodgedtherein. In some embodiments, the distal section 151 expands toapproximately the diameter of the vessel containing the clot. In thismanner, the scaffolding of the distal section 151 can catch any clots orclot fragments that may be too small to be caught by the proximalsection 1512. The diameter and flexibility of the distal section 151 canprovide good wall apposition to leave little (e.g., no) space for clotsmall clots or clot fragments (e.g., the clot fragment 212) to flow pastwhile still allowing blood to flow through the vessel. Once the clot 210and clot fragments are caught in the device 1510, the device 1510 isretrieved back into the catheter 180, for example by distally advancingthe catheter 180 over the device 1510 or pulling the device 1510 intothe catheter 180. During retrieval, the tapered portions 1503 cause thedevice 1510 to be radially compressed back into the catheter 180 alongwith the clot 210 and clot fragment 212. If pieces of the clot 210 breakoff during retrieval (e.g., the clot fragment 212), they can be caughtin the distal section 151, which is the last portion of the device to becompressed into the catheter 180. The catheter 180 may then be removedfrom the body. The distal section 151 thus provides integrated embolicprotection during the clot 210 retrieval procedure (e.g., nor requiringa separate filter or other embolic protection device). In someembodiments in which the device 1510 is formed from a sheet, the edgesof the sheet are not coupled in at least the proximal section 1512 toleave a slot, and the edges may overlap to form a coiled configurationwhen viewed from the distal end to enhance interaction with the clot 210(e.g., by springing open upon release from the catheter 180 and/or byacting as jaws that clamp down on the clot 210 during retrieval of thedevice 1510). In some embodiments in which the device 1510 is formedfrom a tube, the proximal section 1512 comprises a longitudinal slot toform two edges, and the edges may overlap to form a coiled configurationwhen viewed from the distal end to enhance interaction with the clot 210(e.g., by springing open upon release from the catheter 180 and/or byacting as jaws that clamp down on the clot 210 during retrieval of thedevice 1510). In some embodiments in which the clot 210 is proximate toa bifurcation, the diameter of the distal section 151 may substantiallyspan (e.g., span) the junction of a bifurcation, allowing perfusion toefferent vessels.

FIGS. 22A-22C illustrate example embodiments of proximal sections 222,224, 226, comprising additional filaments or features that can enhanceclot retrieval. FIG. 22A illustrates an example embodiment of a proximalsection 222 of a device comprising a plurality of substantiallylongitudinally straight and radially curved filaments 223 extendingbetween the proximal end of the proximal section 222 and the distal endof the proximal section 222. FIG. 22B illustrates an example embodimentof a proximal section 224 of a device comprising a plurality of spiraledfilaments 225 extending between the proximal end of the proximal section224 and the distal end of the proximal section 224 and/or extendingradially outward from the proximal section 224. FIG. 22C illustrates anexample embodiment of a proximal section 226 of a device comprising aplurality of substantially longitudinally straight and radially curvedfilaments 223 extending between the proximal end of the proximal section226 and the distal end of the proximal section 226 and a plurality ofspiraled filaments 225 extending between the proximal end of theproximal section 226 and the distal end of the proximal section 226and/or extending radially outward from the proximal section 226. FIG. 23illustrates an example embodiment of a device 230 comprising a distalsection 236 comprising a plurality of branches 237. The branches 237 mayenhance the capture of stray clots or clot fragments. The branches 237may also be configured to act as a scaffolding to inhibit herniation ofobjects out of a neck of a bifurcation aneurysm. As described herein,any combination or permutation of the proximal, intermediate, and distalsections described herein may be used in an intraluminal device foraneurysm treatment, clot retrieval, or other uses.

Although the subject technology has been disclosed in the context ofcertain embodiments and examples, it will be understood by those skilledin the art that the subject technology extends beyond the specificallydisclosed embodiments to other alternative embodiments and/or uses ofthe subject technology and obvious modifications and equivalentsthereof. In addition, while several variations of the embodiments of thesubject technology have been shown and described in detail, othermodifications, which are within the scope of the subject technology,will be readily apparent to those of skill in the art based upon thisdisclosure. It is also contemplated that various combinations orsub-combinations of the specific features and aspects of the embodimentsmay be made and still fall within the scope of the subject technology.It should be understood that various features and aspects of thedisclosed embodiments can be combined with, or substituted for, oneanother in order to form varying modes of the embodiments of thedisclosed subject technology. Thus, it is intended that the scope of thesubject technology disclosed herein should not be limited by theparticular embodiments described above.

1. An intraluminal device comprising: a proximal section configured toanchor in an afferent vessel; an intermediate section comprising aplurality of struts configured to allow perfusion to efferent vessels;and a distal section configured to act as a scaffolding to inhibitherniation of objects out of a neck of a bifurcation aneurysm; whereineach of the plurality of struts is coupled at a coupling to the distalsection at a region between a proximal end of the distal section and adistal end of the distal section; wherein the distal section is biasedto transition from a first configuration forming a substantiallycylindrical shape to a second configuration forming a substantiallyplanar shape when released from a catheter.
 2. The device of claim 1,wherein the proximal section comprises a hybrid cell design comprisingopen cells and closed cells.
 3. The device of claim 1, wherein theproximal section comprises a plurality of repeating unit cells.
 4. Thedevice of claim 3, wherein the distal section comprises at least onesaid unit cell and at least partially forms a semi-sphere, umbrella,reverse umbrella, or flower shape in an expanded state.
 5. The device ofclaim 1, wherein the proximal section comprises a plurality of wovenfilaments.
 6. The device of claim 1, wherein the proximal sectioncomprises at least one tapered portion.
 7. The device of claim 1,wherein the proximal section has a length between about 5 mm and about30 mm.
 8. The device of claim 1, wherein the proximal section has alength between about 10 mm and about 20 mm.
 9. The device of claim 1,wherein the intermediate section has a length between about 0 mm andabout 6 mm.
 10. The device of claim 1, wherein the substantiallycylindrical shape has an inner surface and an outer surface, and each ofthe inner surface and the outer surface of the substantially cylindricalshape define a respective opposing proximal and distal side of thesubstantially planar shape in the second configuration.
 11. The deviceof claim 1, wherein the distal section has a smallest innercross-sectional dimension in the second configuration that is less thana smallest inner cross-sectional dimension of the proximal section. 12.The device of claim 1, wherein, while transitioning from the firstconfiguration to the second configuration, (i) a distal portion of thedistal section is configured to move radially outwardly and proximallyrelative to the coupling and (ii) a proximal portion of the distalsection is configured to move radially inwardly and distally relative tothe coupling.
 13. The device of claim 12, wherein, while transitioningfrom the first configuration to the second configuration, the distalportion moves to an axial location substantially aligned with thecoupling.
 14. The device of claim 12, wherein, while transitioning fromthe first configuration to the second configuration, the distal portionmoves radially outwardly to define, in the second configuration, anoutermost cross-sectional dimension that is greater than an outermostcross-sectional dimension of the proximal section.
 15. The device ofclaim 12, wherein, while transitioning from the first configuration tothe second configuration, the proximal portion moves to an axiallocation substantially aligned with the coupling.
 16. The device ofclaim 12, wherein, while transitioning from the first configuration tothe second configuration, the proximal portion moves radially inwardlyto define, in the second configuration, an innermost cross-sectionaldimension that is less than an innermost cross-sectional dimension ofthe proximal section.
 17. The device of claim 12, wherein, whentransitioned from the first configuration to the second configuration,the proximal portion defines a first lumen sized smaller than a secondlumen defined by the proximal section.
 18. The device of claim 12,wherein the distal section pivots about the coupling when transitioningfrom the first configuration to the second configuration.
 19. The deviceof claim 1, wherein, while transitioning from the first configuration tothe second configuration, (i) a distal portion of the distal section isconfigured to move radially inwardly and proximally relative to thecoupling and (ii) a proximal portion of the distal section is configuredto move radially outwardly and distally relative to the coupling. 20.The device of claim 19, wherein, while transitioning from the firstconfiguration to the second configuration, the proximal portion movesradially outwardly to define, in the second configuration, an outermostcross-sectional dimension that is greater than an outermostcross-sectional dimension of the proximal section.
 21. The device ofclaim 19, wherein, while transitioning from the first configuration tothe second configuration, the distal portion moves radially inwardly todefine, in the second configuration, an innermost cross-sectionaldimension that is less than an innermost cross-sectional dimension ofthe proximal section.
 22. The device of claim 19, wherein, whentransitioned from the first configuration to the second configuration,the distal portion defines a first lumen sized smaller than a secondlumen defined by the proximal section.
 23. The device of claim 19,wherein the distal section pivots about the coupling when transitioningfrom the first configuration to the second configuration.
 24. The deviceof claim 1, wherein the distal section comprises a plurality of wovenfilaments.
 25. The device of claim 1, wherein the proximal section andthe distal section are integrally cut from a tube or a sheet.
 26. Thedevice of claim 1, wherein the proximal section and the distal sectionare comprised of the same material.
 27. The device of claim 1, whereinthe distal section comprises a covering.